PDF malware analysis — malicious · 34507083e5042104

MALICIOUS

PDF

77.1 KB Created: 2021-07-24 12:48:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13

MD5: 2d667df55431ce6b92ca453ed7ad00fd SHA-1: dda3f7a622192fe7cd408f8feae050f1308ae5b5 SHA-256: 34507083e5042104caae53f63bbfd03d017633e548380dafe8cf6b85c0d3721b

196 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or appear to be part of a link farm designed to manipulate search engine results. The primary attack pattern involves directing users to these potentially malicious URLs, which could lead to phishing or further malware downloads.

Machine Learning

Nyx PDF Classifier malicious score 0.9908

Heuristics 7

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK

PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
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.
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 https://marosme.ro/hirek/file/55427997976.pdf In PDF document text
- http://finproekt-msk.ru/userfiles/file/80444745941.pdfIn PDF document text
- http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b68bd4367---4457586552.pdfIn PDF document text
- http://grodgolf.com/clients/f/fd/fd83fa7079552abb47853a85229f74c1/File/rusajutet.pdfIn PDF document text
- https://projetounificado.com/uploads/files/63511365032.pdfIn PDF document text
- http://thaisomboonautopart.com/userfiles/files/gaxarusirixitemaguf.pdfIn PDF document text
- http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/821hj96p4i89v5uj3hb92or492/58635863945.pdfIn PDF document text
- https://superpart.com/files/norizavukavivileberuvu.pdfIn PDF document text
- http://okulsanmalatya.com/imgup/file/3122635191.pdfIn PDF document text
- https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/f57d7a3ef6ce927a0f16a3c246e94648/puzurebaguk.pdfIn PDF document text
- http://zulassung4you.de/bilder/file/xuzel.pdfIn PDF document text
- https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/u5en83q2fncttuhtavaedsgi6p/wugipinig.pdfIn PDF document text
- https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/12538e65633118cb3b8b56b4c72e5d7b/galomurexekenizi.pdfIn PDF document text
- https://big-affaires.com/img/pics/files/bifinoduwofumobag.pdfIn PDF document text
- http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160903eab8a9b7---satawogeg.pdfIn PDF document text
- https://eternalbliss.net/file/48866218832.pdfIn PDF document text
- http://ambulatorioveterinariosantanna.eu/userfiles/files/8466154443.pdfIn PDF document text
- http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16088355766624---7861594660.pdfIn PDF document text
- http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160796bc4a709d---8266926168.pdfIn PDF document text
- http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606da63e800ce---xizukatesewamu.pdfIn PDF document text
- https://samtee.com/admin/images/file/bawabasuwiwexetakubifus.pdfIn PDF document text
- http://holmeslawfirm-iowa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/32491027268.pdfIn PDF document text
- https://www.sensiblemachines.com/ckfinder/core/connector/php/files/gikemi.pdfIn PDF document text
- https://aquafilling.com/userfiles/file/13885513777.pdfIn PDF document text
- https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b26b75304f0---57145655393.pdfIn PDF document text
- https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/2e35278e141751883cf8d0241be03876/nebivosugolagiviw.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=how+to+become+a+stock+research+analystPDF 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_off0000cca3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCCA3	16088 bytes
SHA-256: `2ed75a7c713ca061904d016e3fbc21ff85a1edca14b67219cbeb54645c1e6f8b`
`font_01_sfnt_off0000f569.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF569	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00010d80.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10D80	10828 bytes
SHA-256: `ca8ae69b72b119d1a6924a0998dc072f0a7c623836b4f08d19abc71852729de9`

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