Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d79ebf661b0b5f0…

MALICIOUS

PDF

71.5 KB Created: 2021-06-09 03:17:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 9f35f21f726a2d3b5e62affd24659753 SHA-1: 31312bd3531c7f1c3e26b511903005a7b5d5ca8d SHA-256: 1d79ebf661b0b5f0333eb425179ab29850d13e31730ab3a821054048ea459bb8
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 https://inwebjor.ru/uplcv?utm_term=how+to+connect+alexa+speaker+to+iphone PDF link annotation
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160720796d33d4---21611278977.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/04f8fe09b72253673e2ddcd6f74d706d/96563209046.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/favajojoj.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/zopudevekuwoxam.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/mupozufuwenem.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0b20f3123---97801849125.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/42300136498.pdfPDF link annotation
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/32f8b4d5a1a0b039446a97f4a1a4d115/loxukutik.pdfIn PDF document text
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/4973d64916ec68b5e30145fd25cf20fa/79635055399.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/kurif.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/60itlf5g204ho8ej6lahv6ek33/warufavagatevuzemusok.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606d364f043b3---parinorijavosok.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/460851da5c798ddb60dda03185e3f260/17596470735.pdfIn PDF document text
    • http://falerisztika.hu/tmp/maziwep.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/95014364434.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9EE 5208 bytes
SHA-256: f86ae471e932659df4e14072f142ffd9434cf6dd5907bc22a0508a8fbe788fdc
font_01_sfnt_off0000ebb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB0 10872 bytes
SHA-256: b6a3527ded2b57e16ecd4e549ce252d9debe5d06cbc18c9827a0d69eabd19ec9