Malicious PDF — malware analysis report

Static analysis result for SHA-256 64155b0d1acde010…

MALICIOUS

PDF

87.1 KB Created: 2021-08-16 01:33:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 6410572ce5621b7ac278258d173334ef SHA-1: e5c327ddfb98324364a2a9db8fae49b58704180e SHA-256: 64155b0d1acde010ab63dd0daa7097bd80b3237b471427828b2e5c2346dc3901
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm hosted on multiple compromised websites, directing users to download further PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a phishing lure designed to trick users into downloading malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/704da9cb51183b15850ed1abc1082105/niluxezipiworirinagofuva.pdf In PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/583ee824ca7a543d55a5943d0584224f/84339127757.pdfIn PDF document text
    • https://mumegram.com/userfiles/file/dasoz.pdfIn PDF document text
    • http://thegioimaychaybo.com/app/webroot/uploads/files/gimawil.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce4a6b2a47---boberokalenivafusekufipa.pdfIn PDF document text
    • https://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/2bsiduva2bv90ircb4pchl9l0c/dabemabovanolapimu.pdfIn PDF document text
    • http://indemo.pl/Image/files/nurajesidejudiminilo.pdfIn PDF document text
    • https://www.pessin-location.fr/ckfinder/userfiles/files/48962855680.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a264cc1675e---pewupitulotoman.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/8a265ea7970c03c746173c6f9508c03d/48757726448.pdfIn PDF document text
    • https://ukmalayalamnews.com/userfiles/file/25147817711.pdfIn PDF document text
    • http://pattersonandoliphantfamily.com/clients/875492/File/zivobuxodom.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/412d1e3cb11385386b788b147bbea345/pagibitido.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160a36c2a8f5bb---duxumenujex.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8325b1577---vipilubukalowo.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/8p0m442igr1o2hkopr1uh8t48n/88961100914.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2956887ba0---41493944748.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/38e7bacedc0ad848020292ebbbd3d033/nemagamanisipiw.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/18250645084.pdfIn PDF document text
    • http://top-conversion.ru/ckfinder/userfiles/files/tuvol.pdfIn PDF document text
    • http://charivne.info/images/file/zurasolafadotojagisowasep.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609277125d7f1---fobow.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/bogamemej.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160731eec7078e---36839880365.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1609c5bba13341---supibafuvalebizazebawini.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=dragon+ball+super+tenkaichi+tag+team+ppsspp+download+highly+compressedPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e17c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE17C 17452 bytes
SHA-256: ecab7420a5b5bdf1cfa256816f5348be8513e767eba5a6e7f19b07cbdd3a01b5
font_01_sfnt_off00010f3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F3A 11492 bytes
SHA-256: d935c1735f5362c86aba33ee43e55e78ce270fd27c4966572c2cc445be48d445
font_02_sfnt_off000129dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129DC 2328 bytes
SHA-256: 97ec669d954d95f7f11ed1d7b8736228109f07c966ab3d6524b1aa4964609446
font_03_sfnt_off00013433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13433 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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