Malicious PDF — malware analysis report

Static analysis result for SHA-256 3da6a16c279c1795…

MALICIOUS

PDF

113.6 KB Created: 2021-06-28 16:44:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: a67c10be987143449465700a2e9c24db SHA-1: 0967dbe1384bbeccb190b9b7cfb10979bd8b2b82 SHA-256: 3da6a16c279c179501980c6c907f1d2bfc19a9071c60c502067f781eb7ad4fad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially exploiting PDF vulnerabilities or using JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9756

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://oniceh.ru/uplcv?utm_term=the+meaning+of+recompense PDF link annotation
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/c6r57m25lu3dggcl59v9gmjope/84392551829.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/73d7760f097320d8fbd99a1f9ba7af23/wigarulepuze.pdfIn PDF document text
    • https://bonafideonline.com.ar/wp-content/plugins/super-forms/uploads/php/files/a2434b362f4d58a57eb0c8ae4f76eb54/61882274642.pdfIn PDF document text
    • https://aarhuskortet.dk/images/file/7561815223.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3550a0880c---kerurebewogibajo.pdfIn PDF document text
    • https://nic-irq.com/userfiles/files/66185432214.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/22090662309.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ae9581e4d45---66799628490.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/lamofuwetimamusere.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/nixefegudikome.pdfIn PDF document text
    • https://activepymes.com/pub/file/pepubuf.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f30275710---49961545391.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/64f065b4199a9e6176801a665df87d4f/pemiv.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/suzap.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16070e51767979---74170955198.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160c9f474814f6---vusojituxinasojumojosewa.pdfIn PDF document text
    • https://candbco.com/ckfinder/userfiles/files/75547468868.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/d25f96fafd639776c1f178aec56dcc92/87313819872.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/jaxatifuvob.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/n2j0crqp353fn20do56bfh2vgh/luwofaf.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca825955f1---salezopovema.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/88539017775.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/2879e4388276d1ff4f22cbd26193b279/kubutetanezowujuke.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/bebaja.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/63783571048.pdfIn PDF document text
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00014d55.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14D55 24500 bytes
SHA-256: 4b92ccca3802f8af52f78cfa1746953701e90f50e3aa068544e1968580c6f1a3
font_00_sfnt_off00010901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10901 28736 bytes
SHA-256: b39b9d696e542587dad65dbcd1b8947836419a03d6b459b08084a2f2abae4b50
font_02_sfnt_off0001796a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1796A 3136 bytes
SHA-256: ef608be22feb7ff8b59cdde16417b998e018098f6d6fee5d990818c46544d8cb
font_03_sfnt_off0001861c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1861C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off00019e33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19E33 10748 bytes
SHA-256: 0ce4ec00884afa131f5a3346e2929f4716c639573336da690639a7b0f3b8b896

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