Malicious PDF — malware analysis report

Static analysis result for SHA-256 7335afe926938e29…

MALICIOUS

PDF

89.9 KB Created: 2021-07-29 09:15:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b36a7d43d0e642626e06b52481dd18df SHA-1: fa709a9996ac9605a8e9c55eee323ecf7210a18f SHA-256: 7335afe926938e2935f4d3fb6624f9e44c9279d4e777125b865c92297c64e1d9
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. The presence of multiple external URIs and a link farm structure strongly suggests a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://handbook.hu/upload/page/file/sotorosotubavawozoditiw.pdf In PDF document text
    • http://ccswcd.com/userfiles/file/mipanosiredudapem.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/m7q0eno9ltci27lbpi1nl0b77m/nugagitepijuxiso.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af8b998d6f1---53254895875.pdfIn PDF document text
    • http://banlinhkienlaptop.com/userfiles/file/dabijaveze.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/58341434896.pdfIn PDF document text
    • http://autoscuolemontagna.it/userfiles/files/91171235998.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/83895337915.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082dfec19458---42754369285.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/4d892319a031aad47cf60ffb28bf8557/85267907748.pdfIn PDF document text
    • http://adria-ex.com/sozajajusimudopufuj.pdfIn PDF document text
    • http://tafgambiatours.com/userfiles/file/vukosidemugoxavakumuz.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbeb3df972---nowabesepisavibodaxojos.pdfIn PDF document text
    • https://cvconstructionsgoa.com/pharma/admin/userfiles/file/ninigilewa.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/35932647697.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160f167c66acac---wosusibim.pdfIn PDF document text
    • https://k-barrierfree.com/FileData/ckfinder/files/20210702_C5B3D4B0CA0E2ABE.pdfIn PDF document text
    • http://sewakendragroup.com/userfiles/file/vidowero.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/27a55d5cba7af23cdf174b9dace1ec6c/84744134935.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/65125616664.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/01e0f24189df4888ce93d935ce5d9860/31726608555.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/sopekiradikavizusikimivon.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/5fs64r3essl8pvft2a4t92nll4/73646486748.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/8e3db3999da1fb597109c83e0d9c420e/40121157105.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=the+gunner+stickman+weapon+hero+mod+apk+1.1.2PDF 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_off0000e200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE200 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA17 11392 bytes
SHA-256: bb1c0ff3ae0ba6074651a2539a824b4ab736508490cc96de7cbd840504d64a73
font_02_sfnt_off000114ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114BA 32056 bytes
SHA-256: bb5682d2e75f061f0c3bc790d6359ff97b5beeee5007620ca8bf47a29f63f919