Malicious PDF — malware analysis report

Static analysis result for SHA-256 1023b3c8033ac2eb…

MALICIOUS

PDF

90.2 KB Created: 2021-07-29 17:49:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 02bea0d65227277d60f690c32a4616b6 SHA-1: 91fbac869aacc02b4f3170848f2f617665bbb2cb SHA-256: 1023b3c8033ac2ebca68bf0202c331f9b3c7b41d919e360cc1226ecccdd0f5b9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of multiple external URIs and link farm indicators strongly supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://inwebjor.ru/uplcv?utm_term=how+to+write+a+proof+of+residency+letter+sample PDF link annotation
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086661509c39---88551045851.pdfIn PDF document text
    • http://bbgannualseminar.com/clients/6/60/607ac775fa755cf068047886b2bbe24d/File/mefageganifujawakade.pdfIn PDF document text
    • http://alexsrmenchion.com/clients/b/bf/bf5401b25fe3457642f5a6f1150d5537/File/mananoxilelabixexi.pdfIn PDF document text
    • http://cc-loges.com/uploads/file/fimebejiveputenexe.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/21f3fabe90355171a07dc07216651762/87847655732.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/wokizufelama.pdfIn PDF document text
    • http://119pump.net/d/files/1960891839.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160986ede5d3f2---monilugaxewu.pdfIn PDF document text
    • http://akbarestate.com/survey/userfiles/files/guxisifozipodabutigaw.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/5if8h6ncrajdbqtm5l4cfdo3mh/diladupaterijimup.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/b9ec7hkgdqiv4hnoldecgiv91e/96674674795.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160e41dbad089b---makulafawiritixegaz.pdfIn PDF document text
    • http://wannawwannie.pl/userfiles/file/3474257123.pdfIn PDF document text
    • http://studiosiciliani.eu/userfiles/files/76071783883.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/b00cgrtbo9udvrm7i9s6mp4pnl/68885667182.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/fipikujakodagizejuxagoluz.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/780994f35e4aeea2b1971df2877ca17e/pobilubulidiranululuziwi.pdfIn PDF document text
    • http://madang.eu/f_pds/fck/file/63463720377.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/830dffe68f18c586728d28c7763e3ada/xoduxuwilapakakelupep.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608648364a7e8---sikak.pdfIn PDF document text
    • http://revucue.com/ckfinder/userfiles/files/nidabawazorilagolege.pdfIn PDF document text
    • http://sakaryakasaplarodasi.org/userfiles/file/4236282950.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/rakerifezemor.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/1c934559a78214f9f07a2927663710ce/lusuvesoxasovob.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-5-24/20210524165547711053.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/92218de4eaadce70b3b198a8651d8ca5/xifenibajebetulage.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB17 10972 bytes
SHA-256: 689a12ae46bf9452af6dd0b0083914c8db35370824e70e5f49865b7f5e38f98b
font_01_sfnt_off00011492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11492 16768 bytes
SHA-256: 2d7bd3037bd8afe3efa24c259e454464e4e7d23e1dfd8851e7f4b122e0be15e3
font_02_sfnt_off0001405c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1405C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1