Malicious PDF — malware analysis report

Static analysis result for SHA-256 a68e4ed015c62817…

MALICIOUS

PDF

84.5 KB Created: 2021-07-19 19:30:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 33386248b2465e50fd3f9d6e40c2bcb5 SHA-1: 1434b70b99e3de26b440e96be66d46b82da8369c SHA-256: a68e4ed015c62817225e241d8c1999d08991cf4d4b9825831533337ccb799264
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many pointing to compromised WordPress upload directories or disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for SEO manipulation or to redirect users to malicious sites. No scripts were extracted, but the structure and URL analysis are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 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://ehomeforeclosure.org/images/file/86675093282.pdf In PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210630115056.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160887a388c74e---moligegesupikifu.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/37376906531.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/7f28d5892f597f8ad15e797289b299a3/77311879385.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af87d83414a---tasasolavunuvidib.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/khoaj1gb03esvbf93g3a4l507b/77447773436.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/k8sd77ob1j276g0486v09ipv47/segixowojukod.pdfIn PDF document text
    • http://pechati-piter.ru/userfiles/file/fusevuxa.pdfIn PDF document text
    • https://mabuksusu.com/contents//files/xobukinofaror.pdfIn PDF document text
    • https://belhasasecurity.com/userfiles/file/93252385655.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e510e16bbfe---jexugudofi.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea92932346---taniruvoduwufexor.pdfIn PDF document text
    • http://www.majbrno.cz/uploads/files/39791630333.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a569fe3b9d7---finifaseselazunosototel.pdfIn PDF document text
    • http://jlm-kg.com/uploads/file/72862371946.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ec6fab4c9---junosaxopegamexirebiwom.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c84d9024b46---54701606743.pdfIn PDF document text
    • http://ytlcases.com/userfiles/file/fogowabinifena.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/vowegepavuzosuti.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092995072eb3---35940486076.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/nozededejogekuneribodof.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/14523700674.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/ec53bafc6cf4be973ecbed1034c58ed8/16104306610.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=how+do+you+make+a+stone+slab+in+minecraftPDF link annotation
    • https://mediaget.com/userfiles/files/88596580801.pdfIn PDF document text
    • 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_off0000e68a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE68A 16732 bytes
SHA-256: 0b6444dcc43d1566e797b64e77f256f2546853362ea4891ded0975ce19ed8da0
font_01_sfnt_off0001124a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1124A 11160 bytes
SHA-256: 33a726c6bad998b058e635d70d83e41939d07bee2df5fc889da82eb7c70295cf
font_02_sfnt_off00012c69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1