Malicious PDF — malware analysis report

Static analysis result for SHA-256 a18e8b8f36f7d64e…

MALICIOUS

PDF

70.4 KB Created: 2021-09-27 20:18:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a2ee825b491e51848835b4e72aa3a64a SHA-1: dd6d41a2cd80b83712c97d16c758daebc7a0bd17 SHA-256: a18e8b8f36f7d64e465e75bf48148b74db25c2c5a8843b3f7a1cd9ce2b0d8ddd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the link farm structure suggests the PDF's primary purpose is to redirect users to malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://laborke.ru/uplcv?utm_term=weather+live+wallpaper+android
    • http://abpaluso.com/upload/file/76450054516.pdf
    • http://rent2day.ca/ci2/userfiles/files/bavodivogarajut.pdf
    • http://w-w.cn/isee/pfm/cms/uploadfile/fck/file/49804065371.pdf
    • https://ienter.bg/files/24155875637.pdf
    • http://catherine-massage.com/ckfinder/userfiles/files/zezeveso.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150b1dbe7a1e---tifudibezutajotakez.pdf
    • http://bahtiyardishekimi.com/fckfiles/file/39002846388.pdf
    • https://elminhaj.org/userfiles/file/22104223401.pdf
    • http://bongoes62.dk/userfiles/file/24864205848.pdf
    • http://topnotchimports.com/ckfinder/userfiles/files/xumusisisigomezaju.pdf
    • https://pakistanchristiancongress.org/userfiles/file/74100752040.pdf
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/64eb9ab3c01ddd51ca10adceebdcfb5e/pexezi.pdf
    • http://tzsunup.com/upload/26969712635.pdf
    • http://vietsinphar.com/uploads/files/82044651312.pdf
    • http://leasingtowers.com/ckfinder/userfiles/files/nolesevosofugona.pdf
    • http://spain-ex.com/images/blog/file/jutasekovowavu.pdf
    • https://floresdeserrezuela.com/aym_image/files/lisosedugevekizesoxij.pdf
    • https://rainwater.cc/images/uploads/files/48275424066.pdf
    • http://abwrichmond.com/uploads/files/99528306596.pdf
    • https://cplastik.com/data/cms/file/vegebososemuzozoj.pdf
    • http://gorillatheory.com/admin/upload/file/81453021628.pdf
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135d5877a468---jigegijomobuzero.pdf
    • http://www.armstrongre.com/files/files/89533233623.pdf
    • https://tanthueviet.vn/img_data/files/64935089019.pdf
    • http://hcbarrett.com/user_area/file/8713092854.pdf
    • http://orderkiwicafe.com/uploads/files/11275354393.pdf
    • http://wagnerpc.com/userfiles/files/saxogodiwel.pdf
    • 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_off0000b203.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB203 16792 bytes
font_01_sfnt_off0000ca1a.bin
44d76b35cd940c2d725f366b9d2aaeff681c75c5d5ea9a942b1b8871dabd0df2
pdf-font-stream PDF embedded font (sfnt) at offset 0xCA1A 10468 bytes
font_02_sfnt_off0000e1cc.bin
da0162c57fde4d6ab2cb8d731e38002df8f3b19092d6982297be91d7e0a67cfd
pdf-font-stream PDF embedded font (sfnt) at offset 0xE1CC 16576 bytes