PDF malware analysis — malicious · b16b93392709d02f

MALICIOUS

PDF

79.0 KB Created: 2021-09-01 17:58:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: 29aeef6f81ce684fb4120bcefd8fddec SHA-1: ed872d9148b15a7878a38125034150145c4f1060 SHA-256: b16b93392709d02fcebbc2194340e6cce6f0cade78e0ff769eac37831b5cf538

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document functions as a link farm, directing users to numerous suspicious URLs hosted on potentially compromised websites. The presence of multiple external URIs and link farm indicators suggests an attempt to redirect users to malicious content or phishing sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9537

Heuristics 6

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

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
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
PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED

The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
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://smidgel.ru/uplcv?utm_term=systems+analysis+%26+design+in+an+age+of+options PDF link annotation
- https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/00aba79159615f37f2a684bbbbae771a/29402212748.pdfIn PDF document text
- http://nw-line.ru/generic/uploaded/fefinej.pdfIn PDF document text
- https://abeess.com/userfiles/file/26230954509.pdfIn PDF document text
- http://highlandhighclassof1962.com/clients/c/c3/c330a44b04b080977bf299ea430a317d/File/luteviboxelijeto.pdfIn PDF document text
- http://manpukulivermore.com/uploads/files/wiporu.pdfIn PDF document text
- http://asavn.vn/uploads/userfiles/files/47501661006.pdfIn PDF document text
- http://auburn-properties.com/userfiles/files/60619242117.pdfIn PDF document text
- http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc2c18dbe0---54800768234.pdfIn PDF document text
- https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/j97atakk1u26um7onjp1pooiu5/31690121293.pdfIn PDF document text
- http://wskinbody.com/data/boardData/files/kasupafutewaxukulek.pdfIn PDF document text
- http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9f07b40d7---24167639939.pdfIn PDF document text
- https://jf-orvalho.pt/userfiles/file/22220674197.pdfIn PDF document text
- https://slezanie.eu/userfiles/file/jigubogiwapagizafig.pdfIn PDF document text
- http://thegioituigiay.net/uploads/files/47802929838.pdfIn PDF document text
- http://tantex.org/tantex/tantexuserfiles/file/zupawiboli.pdfIn PDF document text
- http://tunesistudio.eu/userfiles/files/sarikegatave.pdfIn PDF document text
- http://bannails.com/fckeditor_userfiles/file/12799680854.pdfIn PDF document text
- http://constantemails.com/userfiles/file/1623261844gerorew.pdfIn PDF document text
- http://automsystem.com/UploadFile/file/20210725101116737.pdfIn PDF document text
- https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/a32f471982c718c695d3a828628b4bae/51642213380.pdfIn PDF document text
- https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16128f0dc7685b---45409455002.pdfIn PDF document text
- https://dgaspcsm.ro/ckfinder/userfiles/files/43054359527.pdfIn PDF document text
- https://prolocolidodisavio.org/ckfinder/userfiles/files/59487418907.pdfIn 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_off0000de30.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDE30	17780 bytes
SHA-256: `78882940aff1b3ee50d9e296e37949bf72c947fea35571563e178dddc78daa36`
`font_01_sfnt_off00010ca8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10CA8	10240 bytes
SHA-256: `21917aa66f8294af689ec69456d96b36f0b8de162cfd60547d8152f19c3a0edc`
`font_02_sfnt_off0001239e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1239E	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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