Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ba2871a20de57ae…

MALICIOUS

PDF

74.1 KB Created: 2021-09-16 19:53:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2f27de6c137411b839083f48b21a88d1 SHA-1: 33774ee879fd8b2752dd39053c78cf768deef75b SHA-256: 7ba2871a20de57aeb916dd76e94ed1ae55c934d5c49a14c698b3061a37a7b3d1
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and embedded URLs point towards a malicious document designed to exploit user trust.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://smidgel.ru/uplcv?utm_term=xperia+calendar+apk PDF link annotation
    • http://sheilahancock.net/blogfck/file/5671295206.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/62140568635.pdfIn PDF document text
    • http://perfekt-dom.pl/designhome/admin/userfiles/file/97075343802.pdfIn PDF document text
    • https://sadex.pl/fck/file/94806498745.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/9gcnfe8a0s3c18horg65112su6/55560397076.pdfIn PDF document text
    • https://kede.org/userfiles/file/1180839946.pdfIn PDF document text
    • http://maudchristan.nl/ckfinder/userfiles/files/58629056347.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021090306122870554.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/980d8a9e545310990cdb8327d8618119/xurusadavikuninogivamo.pdfIn PDF document text
    • https://faceless.me/userfiles/files/68960451404.pdfIn PDF document text
    • http://antonellascarpittadesigner.it/userfiles/files/pofesepebaxigozix.pdfIn PDF document text
    • http://precisao.org/files/files/bamujinimap.pdfIn PDF document text
    • https://worldcastlive.com/userfiles/file/nofugi.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/ea5fae14e2c344895f576342bb166f14/54521339727.pdfIn PDF document text
    • http://rejs2013.cycling-recycling.eu/imgturysta/files/94863444857.pdfIn PDF document text
    • http://car-zone.sk/data/data/file/sasutewolidomekojoso.pdfIn PDF document text
    • http://innospectrum.eu/hirlevel/file/fizinunuzovib.pdfIn PDF document text
    • https://dnmpaint.com/sdcc/images/file/75426985001.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/fd344abebcdec02334fff41da8449fad/tidulunu.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16140be44af78e---83396818285.pdfIn PDF document text
    • https://pustelnik-budownictwo.pl/ckfinder/userfiles/files/venebowipobamabuzade.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/16136655da7dcf---63578164910.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/kr5726tdb0b16q14ul8sbf61t5/4243392602.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/6m5cdnksscv4v5tipo4vecqihn/pigizofadamotakasile.pdfIn PDF document text
    • http://syntra.pl/userfiles/file/26861641714.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_off0000b7f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d00e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD00E 10220 bytes
SHA-256: cff863dd0bc0f9d43aa15980c7dba8c05c285a86351a63723223c93bbb35da0c
font_02_sfnt_off0000e6f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F5 20976 bytes
SHA-256: f7a69264622f74af1ed3e34e28edfe65673794be412478b5fdeae517c1d45ba7