Malicious PDF — malware analysis report

Static analysis result for SHA-256 788928342272b98a…

MALICIOUS

PDF

95.6 KB Created: 2021-10-05 09:51:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f754fc82acd721abce7e2f4baeee5e23 SHA-1: b22483f8aab8138e8fe616694a39306c3dfeb04a SHA-256: 788928342272b98a877b159028c9934dedcf1f01343ab24e77b85e65d626777a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised websites or link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The primary attack pattern involves luring users to external sites via a link farm, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

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
  • 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://teewer.mn/ckfinder/userfiles/files/53330500974.pdf
    • http://1qjd.com/upload/files/2021-10-05-13-48-29-EZ3EjpN6.pdf
    • https://epponline.com/mentorfinancial/page_images/file/bakubulidovodipelavejum.pdf
    • http://yilip.net/userData/board/file/81602787690.pdf
    • http://thienanglass.vn/upload/files/nobijategezowiwi.pdf
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1612eef0821bf4---56071845337.pdf
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/dc58cb3203bb05aeb63efbbfa346317d/2705813419.pdf
    • https://kuraniterbiye.com/resimler/files/63198018959.pdf
    • https://innotek.vn/uploads/news_file/mijupepasavato.pdf
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/499nqk45fh6848pkg2hc6cjts6/62252730731.pdf
    • http://kxqcgs.com/filespath/files/20210916101403.pdf
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/0ffb850d96be902e0567a6bca047affe/25833282943.pdf
    • http://geodavidepini.it/userfiles/files/55049561784.pdf
    • http://jianianhuayule.a9188.com/upload_files/art_files/files/20211001_193358.pdf
    • http://eskuvoiiranytu.hu/blog/file/23513532204.pdf
    • http://schubert-hh.de/image/file/71409988597.pdf
    • http://15881588.com/ckupload/files/bixalepogilaxow.pdf
    • http://xyr59.com/filespath/files/20210916041930.pdf
    • http://namhungholdings.com/uploads/ckfinder/files/jumimorevemekuxebapegen.pdf
    • http://grupafurman.pl/!mag2011/userfiles/file/levota.pdf
    • https://aiwatopup.com/ckfinder/userfiles/files/98070924179.pdf
    • http://topbondtape.com/uploadss/file/21911983570.pdf
    • https://marwaautorepair.com/nbloom/fckuploads/file/19010894921.pdf
    • https://rubin2000-distribuitorshop.ro/userfiles/file/wifavedereriserotej.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=chineranian+for+sale
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f631.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF631 16792 bytes
font_01_sfnt_off00010e42.bin
1e1876ab0f82f3eddee866b75cbdd4ce50a1c52c4ef2568f0ef601363b0d9779
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E42 17108 bytes
font_02_sfnt_off0001277e.bin
0c61f0b7bedb14f581eda5ba34da36e45af7242ff566b8a14441a877214240ab
pdf-font-stream PDF embedded font (sfnt) at offset 0x1277E 10244 bytes
font_03_sfnt_off00013e6b.bin
a4a12ab1531fec353a7b293dd03e540e1ba42bc00ea45b88e36a0461c44ede08
pdf-font-stream PDF embedded font (sfnt) at offset 0x13E6B 19080 bytes