Malicious PDF — malware analysis report

Static analysis result for SHA-256 81b353d370a2d741…

MALICIOUS

PDF

90.5 KB Created: 2021-08-15 13:41:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 04149f53cf117fdad13cfee5e4953c71 SHA-1: 2dfb538e1394587fbd3ee926ce5255ed207f6788 SHA-256: 81b353d370a2d7413afe58f1cb13cf37ba10aeea2d55fbce9c28cb7603277723
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a link farm pointing to multiple PDF files hosted on compromised WordPress sites, suggesting a phishing or malware distribution campaign. The presence of external URIs and the nature of the link farm indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/5b1886258a1fe2863a0d51c7e528f171/kudot.pdf In PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5f9kltmeo9hhitjqsj3f90iq95/surekin.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ee97e5dbdc8---zezilikeduverowez.pdfIn PDF document text
    • https://www.idd.no/ckfinder/userfiles/files/86699135901.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aabddc8d9e---janir.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/dj753oipbpfj61g14o7q9j2or4/muperinopaku.pdfIn PDF document text
    • http://caramelitos.sk/files/97939768079.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/107698bef434b4f5239f44074ded37eb/rekubufi.pdfIn PDF document text
    • http://cw-cut.com/uploads/file/guduvoripitabixivomejo.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096faa5cf450---37558761403.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/4b4ede4a2f17e50a371ac9a0d267fb80/78085532311.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/watafavowiwuvo.pdfIn PDF document text
    • https://flexi-cms.com/uploads/file/dafibugotitilev.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles//file/11536117520.pdfIn PDF document text
    • http://betheaskssd.com/flash/betheaskssd.com/file/sibuwemusofuxodufuvuxawo.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1608256f9299d1---logalowivajupitawemidixug.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608692a61a7c7---muwuneluletenurijim.pdfIn PDF document text
    • http://slstudio.it/userfiles/files/gujujavoxezulax.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/cecm8uic7h6ou8svl5oid8pth4/seripapox.pdfIn PDF document text
    • https://synersys.fr/contenu/file/sugoju.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ecaf66152---80106290269.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/8fb0ef954c904980cd713714253c361f/69193596857.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=samsung+galaxy+tab+8+inch+2020PDF 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_off0000fc4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001145c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1145C 17232 bytes
SHA-256: 7385336dc9d4bc00db0955fd45787e3fac801313e65ae9ff8bdde549fac9a863
font_02_sfnt_off0001414a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1414A 11308 bytes
SHA-256: 97d867d96e662bd279de5078f0ddc0d5f27b33a70337d7db7bfaad34193b67db

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