Malicious PDF — malware analysis report

Static analysis result for SHA-256 38552afff06f5893…

MALICIOUS

PDF

88.1 KB Created: 2021-09-03 02:16:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a152a5725ebabed2f9d367c1ea551233 SHA-1: 0faa552dceb791c58292b7add4a11cb1ecc93ecf SHA-256: 38552afff06f5893c0ce497f47debee648213faffa894471a444f5971d495d62
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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 http://gediklimakinahidrolik.com/resimler/files/4489283907.pdf In PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/7df1c2133091c369380c2bdd5ff28587/fonuxixipulimogatimuvisa.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e16af18b8b---41405936336.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609066c72c633---98851232387.pdfIn PDF document text
    • http://xatrbio.com/userfiles/file/50727077069.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/nizatajejumejofos.pdfIn PDF document text
    • https://actor-conseil.com/files/file/wavidexeperireduvaf.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/37910008603.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7ecd4a3e40---saxivetoxinemafa.pdfIn PDF document text
    • http://giovanninociti.com/userfiles/files/40122581877.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-7-7/20210707083136145997.pdfIn PDF document text
    • http://anupbolivia.com/images/files/nilezivob.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161167752a3848---93259151040.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b42ad5194cf---58531434534.pdfIn PDF document text
    • http://intproplaw.com/admin/uploads/file/18547667724.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c34e866def4---jewesawudofonu.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/funawetepoxilibav.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/novoboniwi.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/h2u8fnm13m3c76di7kl3lts0pj/41993884079.pdfIn PDF document text
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/povowugudadetovaforigo.pdfIn PDF document text
    • http://apcmagon.com/userfiles/34375802243.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/fd0852d2df19cc6db3764be7dab0b11e/nazinumigerolibonas.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160958a1bb2d45---88870884609.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-7-17/20210717154135510831.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/78185949948.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=difference+between+organic+and+inorganic+pigments+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d85f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD85F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF070 17864 bytes
SHA-256: 0fd40f8f15a7a5827da8d3c6b25024c4d5f8583be51a9d73818f1792af4b71be
font_02_sfnt_off00010bf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF7 11144 bytes
SHA-256: c364b8792f738c4b10d8c030d66196e3aa312efb1c7925ecd503f5c9fd01f9c0
font_03_sfnt_off000125ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125AB 17352 bytes
SHA-256: 0d9758f2cbc1c48dab3e581ae35b8e0520728669bc6e13667fef8449114342b3

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