Malicious PDF — malware analysis report

Static analysis result for SHA-256 f318331653ebfe5c…

MALICIOUS

PDF

90.7 KB Created: 2021-09-02 10:15:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 6ffb9e731a731ad57766737752d36a49 SHA-1: 9bf74722df8425566ee5ab58f38c517481d1f40b SHA-256: f318331653ebfe5cee60f95334cb9a790b6e3fe5b794fd57e986204bda94df02
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a spearphishing attachment used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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 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
  • 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://studiolegaletrotta.eu/userfiles/files/wojanipomadoribod.pdf In PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160859e17ed5e7---wenuxemudi.pdfIn PDF document text
    • http://lex-ter.ru/admin/ckfinder/userfiles/files/pivubeziv.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9e78949519---digumufitijadozuwonen.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/gimubazegi.pdfIn PDF document text
    • http://ambulatorioveterinariosantanna.eu/userfiles/files/99965817702.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dda25a54105---zepagog.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081025247a43---41543237410.pdfIn PDF document text
    • https://ourlady-schools2.com/userfiles/files/nuwudamepotazatekufaxadoz.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/devonunikoke.pdfIn PDF document text
    • http://extracam.es/app/webroot/arxius/file/kevefirikomewarigamulerin.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/32621989315.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/4569715079.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160824f2eac7c7---39350539201.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/bq15coe7tos1enhlirn61qmmtk/lojupidofizodarul.pdfIn PDF document text
    • http://rrbrentacars.com/files/others/fananifuwafikiporefoti.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/aa4c91b35a7bdd5b0acdf97d6f07ddf6/fiwotuduzavidexekubar.pdfIn PDF document text
    • http://ingpiazza.eu/userfiles/files/39695626418.pdfIn PDF document text
    • http://kag.fr/userfiles/file/rafezegowog.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/zumupukikivonixefofoxip.pdfIn PDF document text
    • https://totspotdaynursery.co.uk/ckfinder/userfiles/files/97901373010.pdfIn PDF document text
    • http://comp-art.ru/userfiles/file/95421619820.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=extension+open+office+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF61 10392 bytes
SHA-256: c699e76bfc3245c07a5b6af4b8af294243571e9c9605b0ecf10161a774ba21ca
font_01_sfnt_off00011705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11705 17752 bytes
SHA-256: 113376cdffc4de704443ff2aead76cc3e7993fc76dc7ce6defe9bca782f507f9
font_02_sfnt_off0001453d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1453D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.