Malicious PDF — malware analysis report

Static analysis result for SHA-256 8daf2da6cc9a56b4…

MALICIOUS

PDF

89.7 KB Created: 2021-08-13 18:57:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b412e5258a965cdf8abfca1cb4f7c2d4 SHA-1: 189cba4ab3594415f11dde090322c22c248226d1 SHA-256: 8daf2da6cc9a56b431e4b8e4fe795bb51570997e25fc985f0588720f7e76044c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identify it as a PDF link farm, with many URLs pointing to compromised WordPress sites and disposable hosting. The document body is heavily obfuscated, but the presence of numerous external links suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://alshamiltrading.com/alshamilfiles/file/23563016659.pdf In PDF document text
    • http://thailaundry.com/imgUpload/files/pelubuvuridirepidim.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d260767ec05---vegimalowotutuna.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160852c6f588db---31842814982.pdfIn PDF document text
    • http://dui-antidote.net/images/userfiles/file/67566911403.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/55f12bb3c8e9da815494a3677e82ea41/24955314555.pdfIn PDF document text
    • http://ih-consultant.com/ckfinder/userfiles/files/75208836000.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da2da605a6c---korew.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/acfc579c0cbbf062e95aab14bd826559/gafamuwuwegizevirusedoker.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/nidunekob.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/n0nenbrqeiuvk4dbodlvn0cag2/lesavetexewotixuxu.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/nazozelov.pdfIn PDF document text
    • http://shopexpert.com/app/webroot/files/userfiles/files/vapizaxawumanobisasanof.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c796a0953a---xowemivefutapo.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/89962384622.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8da38565c---fepinosiwefiv.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160839dc45d8f2---66751324935.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/e35f2c4b3cb37d7f543676cb55798fec/zujimaxalemudovaku.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160a8519932415---43483934163.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/353ad595a9678dcf63bbdf994c46133d/vivusoxedumojulelikime.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/h2rnggkm52eoqmco2g9b37jmuj/12066325960.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/o3v8ks1rkqnb0pu5pfsfn6sn71/wefusawaz.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/kodowirigofasofukonev.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160914175ad7c1---suluxiralibipanadaru.pdfIn PDF document text
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/jewiguvute.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=gattaca+movie+worksheetPDF 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_off0000f9ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000111e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E0 17588 bytes
SHA-256: c89b1480c12567b1bb7663033dad10a89242b846f12c13d98b0adae4ed31a796
font_02_sfnt_off00013fdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FDF 10628 bytes
SHA-256: 3f3e97ff8a04780d3de96d326bc6a98c809c7997e0239d9e5fac4229f373e4f3