Malicious PDF — malware analysis report

Static analysis result for SHA-256 a88ac7cb5aac3ef5…

MALICIOUS

PDF

98.8 KB Created: 2021-09-05 03:15:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: cffb6f97de98b1dda3d6d2d3b725f280 SHA-1: 1ae99d6916e35b361fba07cabccbc1f0020d8317 SHA-256: a88ac7cb5aac3ef516f53f23626cfdea75fc0224b6f498a0edb29436507499cf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a large number of links, many of which point to compromised WordPress upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to download further malware. The embedded URLs suggest a phishing or credential harvesting attempt, disguised as a document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/161086d47a3f2c---jipadirokekijavobep.pdf In PDF document text
    • https://jeevadhara.org/work/london/userfiles/file/21394972701.pdfIn PDF document text
    • https://bwawarszawa.pl/upload/file/64628302947.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/gewuxujarubi.pdfIn PDF document text
    • https://vibangthuaphatlai.net/uploads/files/panodipobubevijiben.pdfIn PDF document text
    • http://igorodstore.ru/files/userfiles/files/6533120925.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/ae6b08cfd9de7061ebe9bd9ec4060dd4/2170893840.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/d6e43d420aeef78f348b89b4ab2f82e7/matixenod.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name//files/wedogagefeligiwulivugimow.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160b639f008713---15503083245.pdfIn PDF document text
    • https://ahirealty.in/admin/userfiles/files/26008840619.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/188b9210ab009f08bbe8a88da176a1cd/48134949417.pdfIn PDF document text
    • http://re-view.online/fckFiles/file/voduvumenotale.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/16626439128.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089edd791751---81870889869.pdfIn PDF document text
    • https://thietbidienmanhcuong.com/upload/files/xateminasidiwa.pdfIn PDF document text
    • http://sokole-tps.pl/userfiles/file/gofeleximutizep.pdfIn PDF document text
    • http://biotledlight.com/userfiles/file///guwewidavodalazemataxun.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/nq0m9rbtkj9jl733004qosuls3/telibijosisegis.pdfIn PDF document text
    • http://mkngsp.ru/upload/files/43915270122.pdfIn PDF document text
    • https://mauspro.net/upload/files/14073623756.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4faa72ac6---46766488176.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/93862162142.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/8f08ofqhnfdlapl2odvmj35pet/60855573129.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=the+imperial+march+piano+pdfPDF 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_off00011b9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B9B 19020 bytes
SHA-256: 482d8296de1a9b5911f5959005c20ba65d6e8bd687ed34299c42798a12c31d61
font_01_sfnt_off00014db9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DB9 10584 bytes
SHA-256: f4b9157646a9c38f20428e034160663907a38e4c1dd98d934748f8f436168f83
font_02_sfnt_off00016595.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16595 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1