Malicious PDF — malware analysis report

Static analysis result for SHA-256 e20014fce0ba19fb…

MALICIOUS

PDF

73.2 KB Created: 2021-09-09 06:42:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8505d30bdc88159039937d4c2c31697a SHA-1: 9531ae1ded7510f94c378ba7659be1298e7e2f11 SHA-256: e20014fce0ba19fb98fc22b9db45d60b63ac502b0eac3ac05a2e9c44fbdbc6da
156 Risk Score

Malware Insights

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

The file is a PDF document identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly suggest an attempt to lure victims to external sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://laborke.ru/uplcv?utm_term=open+eps+file+android PDF link annotation
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/b1fe55abb38b0d553d5d2cf54bec597f/97326454075.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/9443002366.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/3632112345.pdfIn PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/tepevimakavenikoliteboka.pdfIn PDF document text
    • http://pes.edu.mn/ckfinder/userfiles/files/36045589113.pdfIn PDF document text
    • http://investbuild.ru/var/upload/file/79304278026.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210902_183234.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/93154284492.pdfIn PDF document text
    • http://alpinist.store/sribati/editor/uploadfiles/ganofesenijojomatu.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613679740feca---84560848290.pdfIn PDF document text
    • https://topupdana.com/contents/files/tebenubuxovo.pdfIn PDF document text
    • https://mlbcsimleague.com/ckfinder/userfiles/files/332523810.pdfIn PDF document text
    • http://print-printonline.com/ckfinder/userfiles/files/xeferag.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/dc0bdbad0efb222d996df99e3b2ccd8e/14785921398.pdfIn PDF document text
    • https://jnnjhansi.com/userfiles/file/64665839102.pdfIn PDF document text
    • https://iword.de/userfiles/file/61251272704.pdfIn PDF document text
    • https://giorgiosantinelli.it/file/59689936171.pdfIn PDF document text
    • http://finara-v.com/file_media/file_image/file/wiridogabojafufivano.pdfIn PDF document text
    • https://fond.ru/userfiles/file/58647328548.pdfIn PDF document text
    • http://designklasse.de/ckfinder/userfiles/files/mitigejukis.pdfIn PDF document text
    • http://levotst.com/uploads/files/vuzotun.pdfIn PDF document text
    • http://hocomesun.com/upload/mepowomorekovanoxobevetu.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_off0000bc8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC8A 16724 bytes
SHA-256: 684a557cf5318a3be20a8cb368db420e89769953e3aae76385de2a9ba3607be7
font_01_sfnt_off0000e7ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10016 10420 bytes
SHA-256: b31e455f30a4c786d2692035bb577c0a0a2fba7605237e2df19924fa74fb79ba