Malicious PDF — malware analysis report

Static analysis result for SHA-256 3afd638ae20501cd…

MALICIOUS

PDF

69.2 KB Created: 2021-07-21 23:24:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7ed3b45ec015bf4b7b9fe916fc583561 SHA-1: 86e3e00f61b67ed92d8c3da23da90d4dbfd0bda7 SHA-256: 3afd638ae20501cd8eb0504720de2eddb0ebf946d12d9972955eac072959e4e4
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating it is likely a phishing or malware delivery document. Multiple heuristics point to the PDF containing links to compromised WordPress uploads and disposable hosting, suggesting an attempt to host malicious files or redirect users. The presence of embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8974

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 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
  • 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://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/0d6a8a7f61a2d0f2e0d07a491ea97874/14069277705.pdf In PDF document text
    • https://oncetrabzon.com/resimler/files/88366524703.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/wijiromejanitisezu.pdfIn PDF document text
    • http://samrayburnclassof1980reunion.com/clients/873185/File/ravenetopugibotedizo.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/adhabpdca04a34adag2go87ju1/22888411173.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0dd0fe1168---barujodixerugukarizesu.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/66233220379.pdfIn PDF document text
    • http://cy2hand.com/userfiles/54695667921.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/c0pvrk8i1mfmnpa7soo562mjj6/kasifofazavogakulaluguj.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac01e58ce13---18728575141.pdfIn PDF document text
    • http://hkacca.com/userfiles/96355268794.pdfIn PDF document text
    • http://poiskvod.ru/images/file/21107543276.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/31967688968.pdfIn PDF document text
    • https://nenanhduong.vn/Upload/files/68864515167.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/2ef470fa1c904cd30907bbb35a65a63c/vuwejivujubil.pdfIn PDF document text
    • http://zge-led.com/luodan/images/userfiles/file/nilozimezuzizosub.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/105b45cffcefdbbee898ed777d58f83f/26696045620.pdfIn PDF document text
    • http://roughriders66.com/clients/f/fa/fa96273273f04fd2a06feef12b1e4d70/File/sotimexojevovuzojum.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fab0111d3b---xusegotanijat.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/56237320283.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbd262d8fb9---betafefamezososilutuvadox.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/kefalunuwej.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160d3a0c695014---31580146520.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=easyest+game+in+the+worldPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f43b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF43B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1