Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1c3af7b8c16649f…

MALICIOUS

PDF

88.8 KB Created: 2021-07-30 14:15:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: cf62e169fb2898d84c23b6b7ea3d443b SHA-1: cca331dc55c438b9e3d4a237dc778f792f304eb3 SHA-256: a1c3af7b8c16649f37b00ed75d9d48b29fd4434bd8a6fdfd5bdc58c10cfee445
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites, likely serving as landing pages for malicious content. The document body is heavily obfuscated and unreadable, suggesting it's not intended for direct user interaction but rather to host or redirect to malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0e98afd99---tevomovameveje.pdf In PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b7fdd886348---muzinalefikokiguxunojogu.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/nkgt3tlasmo6i1kpnl34j3i4ed/68140096730.pdfIn PDF document text
    • http://menloathertonhigh1980.com/clients/6/6f/6f83464fe0b13873896cace574d4baa5/File/vesijukapidilezano.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b4c73855b5---zekemekitebaponakamipibix.pdfIn PDF document text
    • http://chinazzjx.com/d/files/33483221264.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/ea3172158b0122119ffdf25edff906e2/96322852609.pdfIn PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/repuxutomaxezezowu.pdfIn PDF document text
    • http://urjabatteries.in/userfiles/file/fedabijobofexitixap.pdfIn PDF document text
    • http://china-zzld.com/uploadfile/file///2021062009423791.pdfIn PDF document text
    • http://decamiones.com/userfiles/file/zokekoret.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608da3a44ffa4---63157611160.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609112d838edd---gomonibe.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/b3c7e433e384e2e7b3902061731b8209/mokiwegilugomojipusazazim.pdfIn PDF document text
    • http://interno-kazan.ru/upload/files/77329862362.pdfIn PDF document text
    • http://ingmontagna.com/userfiles/files/11242416217.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/i2d2335gdahu3bf37up999t1t2/17611341709.pdfIn PDF document text
    • http://vandientuchinhhang.com/upload/files/44805532481.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8fa91d5f5---29668335924.pdfIn PDF document text
    • http://jarosi.hu/files/file/dunawikosusoraroxanox.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/figujipisikem.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608606ea4304b---simomipi.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/bcf0283b0a6a504cc3336dc74dbf100c/dixasugakosorupigo.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/lipoteruvejupomimomud.pdfIn PDF document text
    • http://short-story.ru/upload/file/tejemudigupevakogowal.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/kefokodiki.pdfIn PDF document text
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/vufawodatev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=how+do+you+change+the+time+on+a+baby+g+shockPDF 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_off0000f361.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF361 17348 bytes
SHA-256: 21d8393160b5ceec3c625f117f666aac83deac86fa4efdcd72c479257635625c
font_01_sfnt_off0001206b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1206B 11196 bytes
SHA-256: 8a7ad5ddd72e20ff3047de5effd562b617452d8352ce560a18dfe766eaa691b2
font_02_sfnt_off00013a47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1