Malicious PDF — malware analysis report

Static analysis result for SHA-256 29f1c5bfc8250e66…

MALICIOUS

PDF

69.9 KB Created: 2021-09-16 20:01:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c04ac25745d29194e167e84948e715c1 SHA-1: a61b2cfef94a966e911437e45c36f0d044bb3646 SHA-256: 29f1c5bfc8250e667e9a594b90e9cd514f8610c25f20ac783f2ea1941973cc12
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to serve a second-stage payload. No scripts were extracted, but the structure suggests a lure document designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://architettomontanino.eu/userfiles/files/32873835179.pdf In PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/j948dm9af9ddudcbuf2apqaf52/92007016387.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/q63lo6dmiq1ao9ii58p8d4ogbc/kunofekimubajejug.pdfIn PDF document text
    • http://haciogullari.com/depo/sayfaresim/file/luvubuxikafodo.pdfIn PDF document text
    • https://hoangmailogistics.com/asset/site/files/47719093467.pdfIn PDF document text
    • https://profm.hu/files/file/47315772282.pdfIn PDF document text
    • https://nhahangphongcanh.com/uploads/files/23741986389.pdfIn PDF document text
    • http://retailpark.bg/uploads/wysiwyg/files/83545951286.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1614115b6dc09d---tidajomisirewelusofi.pdfIn PDF document text
    • https://fulzugaskozpont.hu/files/zexibejudexofalibu.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/80638492490.pdfIn PDF document text
    • https://jss-moms.si/upload/File/66436457159.pdfIn PDF document text
    • http://zxsolar.com/d/files/93380185915.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/muguxivudesekaxijezopan.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1613f913cea861---loteginusawonupasetaga.pdfIn PDF document text
    • https://mashura.co/userfiles/files/52404637823.pdfIn PDF document text
    • http://wonsakai.com/uploads/files/67469165721.pdfIn PDF document text
    • https://vadihosting.com/calisma2/files/uploads/54287411722.pdfIn PDF document text
    • https://papiratisk.cz/soubory/90463701065.pdfIn PDF document text
    • https://hamzsabegi60szallo.hu/UserFiles/File/sofuzilokuguxozudim.pdfIn PDF document text
    • https://suncables.co/images/file/nujixedufokegujijefoku.pdfIn PDF document text
    • http://naturabliskociebie.pl/userfiles/file/dutadikoxidasi.pdfIn PDF document text
    • http://www.velkoobchod-man.eu/ckfinder/userfiles/files/luwavemejinav.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/68242858265.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/09cdf175c307096aa5823dff341a2633/lisob.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/1359fb8988b1ad456c072eeca5f115a6/54833375945.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=live+for+speed+download+androidPDF 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_off0000b5ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5FF 14220 bytes
SHA-256: f0239b3113dd84470aa5ac9006d38ab8c12a90c7acd5ed2e0e78d721433df042
font_01_sfnt_off0000d989.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD989 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f1a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A0 10504 bytes
SHA-256: 0cf9544576f01ad112803f7bf82bfae9426b2e24a66f5eab7fb7468154d4d606

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