Malicious PDF — malware analysis report

Static analysis result for SHA-256 628ab670b1554922…

MALICIOUS

PDF

94.0 KB Created: 2021-09-10 17:36:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: edf25127a9b138062b5cdce67d5c27fa SHA-1: bbc1e655ad03ac74dc3720c014e73bc781602b27 SHA-256: 628ab670b15549229893abebc1a11cd6a738478198c5ba4e3e9f446fdc9da866
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting. The embedded URLs, while some are benign, contribute to the overall pattern of redirecting users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://organicearthfiji.com/documents/file/463755457.pdf In PDF document text
    • http://bakefruit.com/uploads/files/202109010730588224.pdfIn PDF document text
    • https://komunalno-vrgorac.hr/files/wuruwelolo.pdfIn PDF document text
    • https://dpengineerindia.com/admin/userfiles/file/79082792505.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/72492837794.pdfIn PDF document text
    • http://whipitleather.com/userfiles/file/sojobuzujapan.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/zutamotukenebu.pdfIn PDF document text
    • http://rioairporttransfer.com/ckfinder/userfiles/files/51206335890.pdfIn PDF document text
    • https://euforbiabulgaria.gbinvest.net/uploads/pages/files/widolasanemevisus.pdfIn PDF document text
    • http://xn--d1achljw0b.xn--p1ai/content/upload/kimowuwanolakomopabuwivox.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16137899a7ca2c---12082082186.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/161344165279e3---tixaritebaxugipevuxiwok.pdfIn PDF document text
    • https://wspaperbag.com/userfiles/file/26148330250.pdfIn PDF document text
    • https://ensegun2.com/ckfinder/userfiles/files/30042784416.pdfIn PDF document text
    • http://picart-personal.pl/fckupload/upload/file/xoluvatosipabijizimazumu.pdfIn PDF document text
    • https://suacuacuontoanphat.com/upload/files/58403071132.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613a061623920---gupaf.pdfIn PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/1960546895.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/16988227694.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/4436576359.pdfIn PDF document text
    • http://borik.customreal.sk/data/files/47585616180.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/9f160881fa58e4ece749e4631cbd3814/96098902591.pdfIn PDF document text
    • http://vibestedu.com/_UploadFile/Images/file/boxesekenowukifu.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/266003357.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613a81b18c538---mamojonovaxivenip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=watch+wonder+woman+2+full+moviePDF 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.

FilenameKindSourceSize
font_00_sfnt_off00010ab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB8 10940 bytes
SHA-256: bbb5ba32c9f8a7393df47b579863257ed157630840d871d5c14df5b1cd47fb1e
font_01_sfnt_off000123f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123F6 17828 bytes
SHA-256: 7e4fad8feb22bff85724d64eab1c2997dc847b4e648574e994cf272481d8a01a
font_02_sfnt_off000151bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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