Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1a59f21aea26483…

MALICIOUS

PDF

74.0 KB Created: 2021-09-17 09:30:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: d2b8ccf43670dec65e76466b1a79ca76 SHA-1: 6408f72e7b416894e2a3cb463183b5bfaa47c1bf SHA-256: c1a59f21aea26483193359f94069fbc2644ef3b07072631aa8883df8b9560274
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm and a callback phishing lure, prompting users to call a number for issues like billing or refunds. While no scripts were explicitly extracted, the PDF structure and its association with compromised CMS uploads suggest it's designed to lead users to malicious sites or initiate fraudulent calls.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 7

  • 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.
  • 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://brukikostka.pl/uploads/page/file/32445870294.pdf In PDF document text
    • http://mpwlawpa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/81565432863.pdfIn PDF document text
    • http://biplano.eu/userfiles/files/dokavunevebugitizipig.pdfIn PDF document text
    • http://geofer.eu/userfiles/files/kakerezizazik.pdfIn PDF document text
    • https://cecprint.com/images/file/fopowaguwezotak.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///6509315106.pdfIn PDF document text
    • http://spbmedaks.ru/sites/default/files/uploads/3859547533.pdfIn PDF document text
    • http://gdlejia.com/uploadfile/files/20210913_031529.pdfIn PDF document text
    • http://recrute.fr/files/files/gagosedata.pdfIn PDF document text
    • https://namratalakhotia.com/userfiles/files/juzuwoz.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/161372d5ac0515---46802420553.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/webedudegolo.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139bf1033910---sajedefab.pdfIn PDF document text
    • http://foto-preiss.at/upload_files/files/tinigifetiz.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/2168587348.pdfIn PDF document text
    • http://kdwatch.net/upload/files/2021091021325782.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/cd482a83cd17cbe5247d4db4e51b3bc8/bamopanudimameren.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/juvipujasisegizu.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/161441eb68d1b7---tezid.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/5277987052.pdfIn PDF document text
    • http://rebeccafantarchitetto.it/userfiles/files/vijefitabukejitowozowan.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/26523579488.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=how+to+restart+phone+with+buttonsPDF 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_off0000be2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE2D 17300 bytes
SHA-256: f70443839e724ea815c4970d2c71ec6ba57696a5e985343f07ef8111b08268f6
font_01_sfnt_off0000eac4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC4 10620 bytes
SHA-256: c628f310bc653d224143e02750e0a4ddc806a44fc18f9ff8d581cbe955c206d8
font_02_sfnt_off000102d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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