Malicious PDF — malware analysis report

Static analysis result for SHA-256 c373662a5d110480…

MALICIOUS

PDF

106.2 KB Created: 2021-08-01 13:10:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ce0f8d2c299ce8790cc4cf42155121c5 SHA-1: 1f35c4cd2eeae2a3f537f2ed611a5c58be3075ad SHA-256: c373662a5d1104803328eac2da234c758897cd8e90a8a5f5e517f28a596b3dde
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious content, likely for malware distribution or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://geometrarontani.it/userfiles/files/xapuduzovasazuzuwuk.pdf In PDF document text
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/49db3daf848f4240a7ce2c750dfb52e5/babaramenaperatukiwusula.pdfIn PDF document text
    • http://mdc.ir/ckfinder/userfiles/files/91611547351.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16090a8a257504---talaramuzejogozonem.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f98d3c634---rozixarif.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d557b8a1273---tovasirekazijini.pdfIn PDF document text
    • http://rcsiprojectracker.com/userfiles/files/80641190696.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6d992e935f---zenobavasolovago.pdfIn PDF document text
    • http://nlureunion.com/clients/33063/File/fetomovi.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/2276758b16bf87a5a0b952cf13dec8a4/nonobimuvemep.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160865dcbe6473---34791009890.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607c246759205---12548448564.pdfIn PDF document text
    • https://iwistw.com/upload/files/fadove.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2d9c2178c---golizufidago.pdfIn PDF document text
    • http://www.pibmg.com.br/ckfinder/userfiles/files/files/gefim.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/53528003483.pdfIn PDF document text
    • https://migger.dk/userimages/file/74281357959.pdfIn PDF document text
    • https://hopadive.cz/ckfinder/userfiles/files/99483504299.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/83080738492.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/4nblo3ndkgu99v0m4sknthbo0b/86335008955.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/dfso227o9ltesqf5d08o09vbmf/tefoxebu.pdfIn PDF document text
    • http://developmentassociationofnagaland.org/nbloom/fckuploads/file/13396935890.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=%C5%9Firinler+film+indirPDF 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_off00013ad5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AD5 19616 bytes
SHA-256: afb08dda32d214a8e0a24fabc98f88300bc361055c7e49060fedbcf4ee96a171
font_01_sfnt_off00016aea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16AEA 10116 bytes
SHA-256: c489afb33aaeb77b8432f04a11b32fb076cede51d9a68dd9741e148d31c3493e
font_02_sfnt_off00018157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18157 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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