Malicious PDF — malware analysis report

Static analysis result for SHA-256 bac780ba91668180…

MALICIOUS

PDF

114.7 KB Created: 2021-07-06 16:56:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bdc83897a6759d832e453be398f1bf30 SHA-1: a2f3eb1e73f6e20f79319f12d3ee821a8410b5a9 SHA-256: bac780ba916681807b568839cb8fc2eac03f4183c1d04ec0745f166cb2862333
96 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites. The ML classifier strongly indicates maliciousness, and the link farm structure suggests an attempt to manipulate search engine rankings or distribute malicious content. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 5

  • 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://gujaratisamajparis.org/upload/files/daralamufikuwewofepib.pdf In PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/4c941e820f8114789774226b9f4b86db/kurivurid.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/ja3koq2hv24lbmv1k62kl96hu2/68029345577.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/jubemol.pdfIn PDF document text
    • http://medicamarsala.it/userfiles/files/tifebijebifuriwa.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/vcptuc49qn5o19vn0u4ijtetk2/bozunudirezatezerekire.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/2c1561392ad17a39182296befeb9772e/fakiruniwipexinob.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16092096209c41---kuwurelu.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/8f95f0ad9a2b0774d9b66fb5c761dda3/jorilesadexuxunovifonive.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c38e56030fd---dizuj.pdfIn PDF document text
    • http://www.wiz-fac.com/uploadImg/file/rakobusakimivobimisese.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/5057925917.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beccd5d7b0e---85400723639.pdfIn PDF document text
    • https://olterus.net/contents//files/69619883289.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d062c7e20---76750438448.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16076299da2938---fifuwajoloxinevonuguk.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a176b4e1300---zejewirininopi.pdfIn PDF document text
    • http://bogieclassof67.com/clients/71235/File/60239304090.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/33634917765.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/304d04dff8e5cb5995f67a9f2b6399e3/lunerelusu.pdfIn PDF document text
    • http://atallmed.com/userfiles/files/8407715968.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=rationalism+and+empiricism+in+philosophyPDF 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_off00015b2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00017341.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17341 10940 bytes
SHA-256: e8f2d19a0f809cfa8c0edbc99d726d720cd2a23d875161d47a6e0a6fabbb81ba
font_02_sfnt_off00018c66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18C66 19468 bytes
SHA-256: a412fab685bd12df35fbb316164f682db2a0329d1fb4eff6a6d7dc0bb4905d4c