Malicious PDF — malware analysis report

Static analysis result for SHA-256 126817b6b7b70d26…

MALICIOUS

PDF

77.3 KB Created: 2021-08-06 15:08:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 58bdd18fa986c51bcd28757365ec4bcb SHA-1: b6a9d43c05144c0d59ee276c2964a6f227683d81 SHA-256: 126817b6b7b70d2602237a523913236196819142d39f9c25db44c81d6d38a079
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by ClamAV and an ML classifier, indicating it likely serves as a phishing or trojan delivery mechanism. The document contains a high number of external links, many pointing to compromised WordPress sites, suggesting a link farm or SEO poisoning tactic to distribute malicious content. While no scripts were explicitly extracted, the PDF format itself can embed JavaScript, and the presence of external links implies a potential for further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://crewmak.ru/uplcv?utm_term=tucanes+de+tijuana+discografia+completa+mega PDF link annotation
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0cd35741c---bolabaj.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/vg5np0riehmppccb6kjb78n8gl/vulibiw.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098a09d09bb2---51363628326.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160afd380af411---92962663378.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e41fc54fa0---19474622162.pdfIn PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/86059748278.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/111412e18b5c374a4d8b4cc93cf58917/42026231942.pdfIn PDF document text
    • https://247hvac.ca/fabulous1/uploads/files/miboza.pdfIn PDF document text
    • http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kikiji.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa81c16d6a---veroxepiwomefulimuzivevo.pdfIn PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/76565406863.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/zaxubezapomotakaze.pdfIn PDF document text
    • https://morabia.fi/images/file/73680744939.pdfIn PDF document text
    • http://blueyee.com/upload/file/020922442727.pdfIn PDF document text
    • http://kfbi.ru/content/file/putejewojurabilurad.pdfIn PDF document text
    • https://krassimirtaskov.com/userfiles/files/5856345711.pdfIn PDF document text
    • http://eurekaelearning.com/upload/news/file/fokubufasakagesoxafexi.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c747925e94---zasaw.pdfIn PDF document text
    • https://puppometalli.eu/file/85390102372.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/94970f9020c29f6f37f6b694b31f9795/limuwonag.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bdd414ca04d---67304408310.pdfIn PDF document text
    • https://norservis.cz/files/files/nefabir.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0c2ce428b7---sogubomovogopulo.pdfIn PDF document text
    • http://ambulatorioveterinariobubiniregini.eu/userfiles/files/19576551091.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/e18902f2a5790e610790f54f5667aa89/datutonan.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/udusia5qinoalu743s05oq35q4/tidapu.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://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_off0000caca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCACA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e2dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DC 17312 bytes
SHA-256: a3556bc0c091224aeca81234f1b2b57b4d42f299da223a1cca73b1af44fff31d
font_02_sfnt_off00010f7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F7B 11156 bytes
SHA-256: 9c557a3be7f9f008a34453b337b58221c1d71dd4b39df2db062763b3f9cecb11

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