PDF malware analysis — malicious · aa99790e9d6519ee

MALICIOUS

PDF

86.8 KB Created: 2021-06-28 06:13:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: 6ab6a7aba5d66961968860b8e12a3ce1 SHA-1: ac9783033da1024b0af36bf6b22f6cba3fb1dea5 SHA-256: aa99790e9d6519eef56e7c7f948d09ef4e9e5b56ba67bc38e0c47f30db1f98d6

216 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links to external sites, many of which appear to be compromised WordPress installations used for hosting PDF files. The document also exhibits characteristics of a password-protected archive lure and a callback phishing scam, suggesting it's designed to trick the user into downloading and decrypting a malicious payload.

Machine Learning

Nyx PDF Classifier malicious score 0.9835

Heuristics 8

ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE

Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM

PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM

Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
Callback phishing phone lure medium SE_CALLBACK_LURE

Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
External URI info PDF_URI

PDF contains an external URL action
Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL

The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
URL http://owv-sad.de/userfiles/files/22727288871.pdf In PDF document text
- https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/c89368f1ce40c8c712fe4357eb9b0b12/wowapijag.pdfIn PDF document text
- http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16085a22d6265f---58263987848.pdfIn PDF document text
- http://minhanh.com/files/jenafase.pdfIn PDF document text
- https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160806e7005d40---34818255241.pdfIn PDF document text
- http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607228446eee7---35851931143.pdfIn PDF document text
- https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/pjhrspu5s3gu6m5fqbdfiv1a1q/fisaberaziguresiburuf.pdfIn PDF document text
- https://ptkas.com/kingkong/userfiles/files/fimoda.pdfIn PDF document text
- https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/6b9a16424d3881d2641a37c13d2ca080/rasazibibajopamotebebike.pdfIn PDF document text
- https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/iaegqccqrf0nldu55f9rghgrnd/puvalif.pdfIn PDF document text
- https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2ac38f0455---xovotivowinidozisuwokow.pdfIn PDF document text
- http://muslimofwestbengal.com/mwb/editor_upload/files/ruzopojazadezipurimutet.pdfIn PDF document text
- http://alemotta.com/resources/original/file/dawemalomosejijetufoselo.pdfIn PDF document text
- https://bouveau-consulting.com/userfiles/file/21869215920.pdfIn PDF document text
- http://wallsfamilyreunion.com/clients/876683/File/bikovibamazilonufuto.pdfIn PDF document text
- https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c64a77eb712---17928604115.pdfIn PDF document text
- https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/qufbc52la9oiu1ig34ft34pkh7/dorikiwuvexalato.pdfIn PDF document text
- http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aed8e6330b---51898357922.pdfIn PDF document text
- http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a47c558483a---zebegajomufikobuzopejep.pdfIn PDF document text
- http://adabaskimerkezi.com/upload/file/foveb.pdfIn PDF document text
- https://binarbaidservices.com/public_html/userfiles/file/dugas.pdfIn PDF document text
- http://pusancard.com/userData/board/file/gekirajolozagesipomoguwi.pdfIn PDF document text
- https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/3rlu54augc4jeb2fnoeobo33rd/97726395531.pdfIn PDF document text
- https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608aee797c0a9---dodegidoratapodiviselix.pdfIn PDF document text
- http://anoh.net/pds/userfiles/files/nekekabelizoluvonuromete.pdfIn PDF document text
- http://isgsrl.it/images/file/93474732383.pdfIn PDF document text
- https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/b4615scph5qe32sbc0f057pd4j/28938632284.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=over+50+bodybuilding+competition+2020PDF link annotation
- http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
- http://purl.org/dc/elements/1.1/In PDF document text
- http://ns.adobe.com/pdf/1.3/In PDF document text
- http://ns.adobe.com/xap/1.0/In PDF document text
- http://ns.adobe.com/xap/1.0/mm/In PDF document text
- http://ns.adobe.com/xap/1.0/rights/In PDF document text
- http://dejavu.sourceforge.netIn PDF document text
- http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000eae1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEAE1	11348 bytes
SHA-256: `41cef9d08fa1e087dd8112d0f2c54d6cb20e31b7afe3aff2831d7e058e929d1d`
`font_01_sfnt_off0001053a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1053A	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00011d4c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11D4C	17908 bytes
SHA-256: `1ab996f7a364edd0d442654b5d73293fa67cc530228ece0bae2378972e50bf57`

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