Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbc1b89925f86ea1…

MALICIOUS

PDF

73.6 KB Created: 2021-09-04 17:11:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 597175b6af989a616ee701c87b3798d3 SHA-1: cd47aeae3e95c936308cdb866498bb28d8256dcd SHA-256: bbc1b89925f86ea18166c3ba859570c89d454c3fe85f31a0a215c190f6ce2422
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating it likely contains malicious content. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and disposable domains. These links are designed to lure users to potentially malicious destinations, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://allytemp.ru/uplcv?utm_term=thermador+dwhd650wfp+installation+manual PDF link annotation
    • https://contactfm.be/userfiles/files/timogimoxepoli.pdfIn PDF document text
    • https://www.ijestr.com/ckfinder/userfiles/files/tijovakejaxowokesomuxod.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095483e251c4---93541882126.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/acf3e30a76d9d7e9979a558ec2ed1857/10784790725.pdfIn PDF document text
    • https://atkarisuli.hu/userfiles/file/jasumuburixefuzopur.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/wevutawiseneketuxutigiv.pdfIn PDF document text
    • http://loca-granderoue-montaletang.com/ckfinder/userfiles/files/wedusizizijel.pdfIn PDF document text
    • https://jmtours.co/aym_image/files/8911708302.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cde791fce2---reduliletimajodaw.pdfIn PDF document text
    • http://wmehoa.org/clients/d/df/dff1b85474dadb967ea0c40f6d5e37f8/File/rikaxovojubaposikojozetij.pdfIn PDF document text
    • https://copab.tn/216mag.svn/uploads/files/72150666210.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160977aeb2b767---fofuwapi.pdfIn PDF document text
    • http://biomassasia.net/data_ed/userfiles/file/50792287140.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609628f94fae6---66940797207.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9312983723---8441860064.pdfIn PDF document text
    • https://vialivonica.eu/userfiles/files/gazunibifabemojega.pdfIn PDF document text
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/afhdc0i4t14lk723iqft1ophgt/tufefalalusevanakogas.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/a326dd3c44bf3aeac55f447c9a03adb3/4124679419.pdfIn PDF document text
    • https://bibonatura.com/ckfinder/userfiles/files/ladozila.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/04d32ee82eea9aac897aa4f2120d7d3d/59579547422.pdfIn PDF document text
    • http://inventory-acepipe.com/images/uploads/files/furerimalasereba.pdfIn PDF document text
    • http://creativecoms.net/userfiles/file/77659973920.pdfIn PDF document text
    • http://maryalo.com/userData/board/file/tikexukotobo.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_off0000b97e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB97E 16600 bytes
SHA-256: a91b7c4f96d234503c5338f66bf00e45372ad715af287af3ca45e99392e9d84c
font_01_sfnt_off0000e440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE440 11336 bytes
SHA-256: c408665ce7547312bcc5b76da1c5855cd4c5bebb6f5052a72357c4a237493537
font_02_sfnt_off0000fedf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1