Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1a0e549c80799d6…

MALICIOUS

PDF

88.3 KB Created: 2021-06-30 09:15:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: b2e7072c9ab964bbaa32d8fce0d726cb SHA-1: 71b028cc12b372cc10b95d0359244ce205d1f3e7 SHA-256: a1a0e549c80799d6f103a3b6517c113a4d2fdfb323a4d2cd9496aff6d0e5aae9
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous external URLs, many hosted on compromised WordPress sites, suggesting an attempt to lure users to malicious content. The document body is unreadable, but the heuristic firings strongly indicate a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160af7a3c487db---56605560949.pdf In PDF document text
    • https://hmanagement.net/userfiles/file/zigumakagofa.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092945a05a58---nepofupisejutebe.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/62469492795.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/37751380071.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/676649cb8b86da61e479c961e336cbaf/21095084683.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/96744862887.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/thcv6h7gu8jom3k2uuesbfkb76/fulowabinojipim.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/19614125547.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/80200dfb765c0b0c1bcd0fab9298ae66/bokenuvamebupiwivukevega.pdfIn PDF document text
    • http://www.klimavill.com//data/editorfile/33325317027.pdfIn PDF document text
    • http://accronline.com/userfiles/file/12584802887.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/gejuse.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd00479d7e5---pivad.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d1f6aa6e017---bagonodutovogimemudatolul.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c16cc5cde94---89780123301.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081b7d2302d0---38469918834.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160abce3df0d7e---99051476014.pdfIn PDF document text
    • https://nasikampung.info/contents//files/65255317453.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607afc16867e4---zelugozununiboxodazotosa.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16079910701d63---2247831794.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/cde8c191fb3e7ac1a108a6035e7ecf33/dasokutupelimamip.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/03l2qsaeplgrb897vqme8ssvk6/84725584300.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=associative+mapping+cachePDF 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_off0000f4fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FE 10724 bytes
SHA-256: 0ff83bbd9bbecb29465f90ba94b2ae5d5d888756e3d337cd515b029c8211c4fc
font_01_sfnt_off00010d7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D7E 17680 bytes
SHA-256: 3f3541a31f5f778ebe6d0a5786635e896485bf9d15eec2d0eb374f4a77b4a710
font_02_sfnt_off00013bbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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