Malicious PDF — malware analysis report

Static analysis result for SHA-256 f88f1c923eb36968…

MALICIOUS

PDF

77.7 KB Created: 2021-09-06 10:29:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c6d210c6ba6f1dfa09a0ffcba7246d18 SHA-1: ce3c1c56af614837e78e94ae24f28a4a0ce29895 SHA-256: f88f1c923eb36968b61ddfa77507273d3f7fed6716a20224b2893d671b74b956
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to lure users to malicious sites. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the heuristic findings strongly indicate a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5219

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://uangraja.com/contents//files/98856110195.pdf In PDF document text
    • https://hanyauntuktesting.com/contents//files/gupalejovuxile.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/dcb2f67f0ac83326cdfbdc6c13f005d6/45536212058.pdfIn PDF document text
    • http://latexindia.com/userfiles/file/zinos.pdfIn PDF document text
    • http://asirakademi.com/resimler/files/244083854.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a89a2508efe---sovimulomuvuja.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606f45fcb8885---14511121731.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/sadoluxupudowotisakiki.pdfIn PDF document text
    • http://xn--4k0b43gkwo4gn.com/upload/editor/file/64773753751.pdfIn PDF document text
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/sekewutujudasenodifipav.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/1umjgf0h7qeka31lggvkbe57p5/luzevivasoru.pdfIn PDF document text
    • http://tamilannuaire.com/var/www/vhosts/vps296430.ovh.net/tamilannuaire.com/images/file/13922099053.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161261549a9a49---17999092356.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/a8e2b3499f7924b48159b61216112630/63987607913.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/1cd97b31ecd5b16a110142afa8ac2779/mojamufadopufubod.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/0248b605c91a0ac799e69280f86ddf94/15756220507.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16090ccc430bb7---mijotojasuwe.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/fb73c893ef7ab164d03d85382c8696a9/77419075161.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160832c257540d---telarodamuwudapi.pdfIn PDF document text
    • http://viajaconsciente.com/imagenes/userfiles/file/wufadamuposegu.pdfIn PDF document text
    • http://cropscipublisher.com/files/upfiles/file/45489025739.pdfIn PDF document text
    • http://rafaelokazakov.com/file/92288434602.pdfIn PDF document text
    • https://freebcard.com/ckfinder/userfiles/files/borejijazeke.pdfIn PDF document text
    • http://brlairport.com/images/file/vibevatupifuzavupurisem.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/1coequqh4ibkim3ue13hm4hoh8/54317576490.pdfIn PDF document text
    • https://wietsevoermans.nl/ckfinder/userfiles/files/bikusamisujisafiselowener.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=2011+scion+xb+repair+manualPDF link annotation
    • 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_off0000d5b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B7 16740 bytes
SHA-256: 7dbc132a0f4833bc6f2a0c6b0a5251b90b19136e157dca8a7bfe81a83af761bb
font_01_sfnt_off00010180.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10180 10976 bytes
SHA-256: ee7ed79f4c6b291d6a287253e9a3a0e615c5f53d82fe4498df0518aeb65020da
font_02_sfnt_off00011acd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ACD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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