Malicious PDF — malware analysis report

Static analysis result for SHA-256 c36e37708afcf426…

MALICIOUS

PDF

172.9 KB Created: 2021-07-18 06:53:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2ef19f7059f9cfedc2fcd84dcc7e3798 SHA-1: 34d16b2c60e2183ffe62b37afcf3813b13032157 SHA-256: c36e37708afcf426bcd538d135f565dc9e4520127bff84c55a401b7d27af9cdf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated and unreadable, but the presence of numerous links to potentially malicious domains is the primary indicator of its attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/8b6svg6p4v388s9jrp2iihshc8/62268440045.pdf
    • https://advantagelic.com/singhania/downloads/file/30586715880.pdf
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/44e03e28e3517eb392e464e1a08c5726/94847816850.pdf
    • http://cascinamana.it/userfiles/file/xixabuwa.pdf
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/f4b9af725e3660ec91ff638915925adc/20341077633.pdf
    • http://richardarnoldalumni.com/clients/a/ad/ad1dcfa6f69ac51e3fe6bec18f6cf6d6/File/5435886326.pdf
    • https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/6083331e8d859600ee680a86b279a12f/19337101212.pdf
    • http://atrsara.ir/resource/files/mupajepunuvodepa.pdf
    • http://orem.mn/uploads/files/18244849111.pdf
    • https://darshanam.com/ckfinder/userfiles/files/zixugizapurowuwodila.pdf
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/24b215b929ec1311e505370af77d177e/digisorodasi.pdf
    • http://khanaphatgroup.com/UserFiles/file/43651544029.pdf
    • https://bacninhonline.com/webroot/img/files/xomepifapikubokowiwojo.pdf
    • http://asfus.net/virgsurv/userfiles/file/pabuzikivajomikowem.pdf
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/a6a5524475b624f740820da91cc3bd80/37120437045.pdf
    • http://aftckwt.com/uploads/file/nimuwimoriguja.pdf
    • http://bigband-ulm.de/userfiles/files/bujigo.pdf
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/22889fda4f6da80300a19c831b168b32/nowujavilonemulixagalo.pdf
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160768f1334af2---46837689835.pdf
    • http://say-international.eu/userfiles/file/mapuvukomifopopoxa.pdf
    • https://liniagdanskzydowo.pl/files/vulukusijowuxejoximakug.pdf
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/d9daf5ad922eae6ece0b34dc8d50cc40/nutazetugasazakulimab.pdf
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/a35i0n2ffuhatenib4okvpv7iphhr4lp/53794680574.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=frederick+ii+the+great
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0002419f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x2419F 16792 bytes
font_01_sfnt_off000259b1.bin
a8095cdf0c3f4c9ad67a4c7b101664ccd92874d45e4071493dba610a9ff96dbd
pdf-font-stream PDF embedded font (sfnt) at offset 0x259B1 21080 bytes
font_02_sfnt_off00028d9f.bin
c8c9ff7489aa3f105005762d631c0e2af1ba18706f6b29a74eabb5e2e76cc9e5
pdf-font-stream PDF embedded font (sfnt) at offset 0x28D9F 10280 bytes