Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c47fd568ffa4555…

MALICIOUS

PDF

95.4 KB Created: 2021-06-30 01:47:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c35942dc82f4d77c36296354bca29fb0 SHA-1: 31a7513c8ba4b975433fd61caa85ab9c5bbf4905 SHA-256: 4c47fd568ffa45552e1c030de9b30be2b29705962e1c36a3f08c5cc680dcf916
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous embedded links, many pointing to compromised WordPress installations, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of an attempt to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 7

  • 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
  • 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://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160755c42cc7de---12475168306.pdf
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608816e85dcf6---perutima.pdf
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4f4a8ee24---kosako.pdf
    • http://charivne.info/images/file/bixemodimi.pdf
    • http://say-international.eu/userfiles/file/rebavoxidegesibogemufisin.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/fq6glm9pia7fvis406ml8homp2/rumafevigifozebos.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c557ef8cbf9---pebubex.pdf
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/bd21e1978d2f5861205573ad2e6db015/82225602003.pdf
    • https://renault-service.com/userfiles/nifisezow.pdf
    • https://riondene.ch/img/uploads/file/tamuragojokevukowosokis.pdf
    • https://lamaisonducoeur.ca/upload/editor/file/62737626440.pdf
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/o2qf372vuc0ou1ks54qgt8q52t/22508187448.pdf
    • http://autohondl.cz/userfiles/file/30776710274.pdf
    • http://raiders71.com/clients/4/41/4134020f2f298c111575624a380fabfc/File/98267869076.pdf
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/ln6l24l5jb0dsif33e9mfg26l0/foregoxiko.pdf
    • http://bandenplaats.nl/cmsimages/file/58462995315.pdf
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/de37a524716695351eb1fe124dc53895/remusikofulajadebusi.pdf
    • http://septumdent.com/img/userfiles/files/rogaxebosatixanitaxabur.pdf
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa4e7eb3f16---75155320034.pdf
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/bj1tqivn4lllplo72ksrfo83vq/ravanikunikoniz.pdf
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6da4459be---41436731714.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/getos5kdherr6qhsp4556qfb90/rewebibunadapiz.pdf
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160764e171872f---52271373105.pdf
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac3e32fc09---85818958203.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=icd+code+for+lethargy
    • 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_off0001104f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1104F 16792 bytes
font_01_sfnt_off00012861.bin
1a97edb323439110fed51a3dca171c57a59ed343d1a7f63938befd96560859b9
pdf-font-stream PDF embedded font (sfnt) at offset 0x12861 17704 bytes
font_02_sfnt_off00015721.bin
0927774e09aed148af2129e440b610770c9298d5c36aebd3f2dd646fff6efbde
pdf-font-stream PDF embedded font (sfnt) at offset 0x15721 10456 bytes