Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0cc0dcd32ea390b…

MALICIOUS

PDF

87.6 KB Created: 2021-07-24 05:51:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3e797dffd2708f042d7d1a24c561537b SHA-1: ac890d6c8cd62f999abf14df50ba5504ca12c79a SHA-256: a0cc0dcd32ea390b55a6f0818e27d6029ca91576cdfe9f4b74214267a0234b2b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver malicious payloads or redirect to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://ijmscr.com/ckfinder/userfiles/files/luneponofevekazidanoxop.pdf In PDF document text
    • http://stalmost.pl/userfiles/file/wogevepoboziri.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/2b1a8c4f4c857bee6f5d8d2451a9c4a4/15588091314.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/50920382696.pdfIn PDF document text
    • http://abpaluso.com/upload/file/40621126472.pdfIn PDF document text
    • http://chickendaylacrescenta.com/uploads/files/rorobesitevapukesoke.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/774f1f027d7874d8b9bb94a6f0671b45/936026690.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f937d16a22---42752477227.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/73994810262.pdfIn PDF document text
    • https://greffedecheveux.center/upload/ckfinder/files/94096234804.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b46f339dfe---15515965398.pdfIn PDF document text
    • http://hillandcunnreunion.com/clients/864369/File/51097316888.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c68117629b---sidalofekevogezapip.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/jogexenorowomejabeminowen.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/4eavs8e91tqoat0m0mak550lf8/74302188449.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/a4ec118d7500a9085ba135d30321d0ad/bipovapobuge.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aeeff9a052---rilipegejasamatusizarefis.pdfIn PDF document text
    • http://itcck.org/upload/editor/file/vexuxogaxifexexikigezofej.pdfIn PDF document text
    • http://flexa.cz/docs/file/zogumozamena.pdfIn PDF document text
    • http://xn----8sbemnkjd7bfu.xn--p1ai/design/img/upload/file/fupofoge.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/34131915794.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/64j0n8ic1vhrbpbe7jocj99lgq/47549542002.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=how+do+i+cite+text+evidencePDF 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_off0000f1a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000109b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B2 17996 bytes
SHA-256: 8d33cf198c64cfab9e0c5fe240753ee86830a2551195d93d15383cdb7842612a
font_02_sfnt_off00013780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13780 10132 bytes
SHA-256: 98869cb87a0fb4fcb6ab6ef4e2a13f8d70b96c2bb2bf7707cb15c915498b15a4

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