Malicious PDF — malware analysis report

Static analysis result for SHA-256 11ce3f1b7798da4c…

MALICIOUS

PDF

143.6 KB Created: 2021-06-20 03:27:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: e35540df8a7428f710996a64e93240eb SHA-1: 86ef03bc55f720d4dddc490729f8a93413eccf19 SHA-256: 11ce3f1b7798da4ce36cbf1391c7bb496cd8c429cc8d0719ea630f2a0c203262
156 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 0.9992

Heuristics 6

  • 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 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://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/sao6jbh1n1arainepk0aptoh8k/20519011243.pdf In PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f45a9e396---17023152419.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/a1hi1tipgc5iff13163n0npm31/vowezukajitu.pdfIn PDF document text
    • http://laweasy.kr/userfiles/file/jaziduli.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b87cd12ea8---lewusejabizivef.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b773e3478d3---88465666597.pdfIn PDF document text
    • http://alexhoffordphotography.com/temp/files/file/41862010840.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/satabom.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160803037a8964---28204766211.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8sf71adhv7kj4a2vvo4qnaf6b3/24029241824.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/54569048056.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160859e807fa5e---kiwowijasuwij.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/23859625737.pdfIn PDF document text
    • http://comp-art.ru/userfiles/file/55642799234.pdfIn PDF document text
    • http://se-ty.ru/uploads/userfiles/file/16768496689.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/5ea5fb2df3b9300b53719e51c6be872f/kitupapiposokotefu.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/33e0186782ca2c75429320e5d7a6fcbc/10430375747.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=five+nights+at+freddy%2527s+2+phone+callsPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001df67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DF67 5488 bytes
SHA-256: f1fff9bede31405584c065147b612250180a46daf5139b55f6603ed18574766e
font_01_sfnt_off0001f220.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F220 14536 bytes
SHA-256: 1d3ae2ef61c7f3a1142b2071f28be35abfe512d3e06806dec0772f15f360e0bf
font_02_sfnt_off00021fa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21FA8 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c