Malicious PDF — malware analysis report

Static analysis result for SHA-256 56c03791d58199f6…

MALICIOUS

PDF

85.2 KB Created: 2021-09-11 07:19:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 21c63bb2e07f21fcc4ccb406b28f8cd7 SHA-1: 448fe4c6dc4de2b8560f8425cb38c7764c1f14ec SHA-256: 56c03791d58199f6f35f93b0c33ded2ad9c4b19e340145fae5e5cb028d6fa0b3
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and numerous external links. Several links point to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The embedded JavaScript likely facilitates the redirection to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=romance+novels+read+online+free PDF link annotation
    • http://tandartsindex.nl/images/uploads/gegiz.pdfIn PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/10575913743.pdfIn PDF document text
    • https://simbhaolipower.com/images/file/xemuxu.pdfIn PDF document text
    • http://flyingfish-stay.com/userfiles/file/lujapidalo.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/vukijozawosuzaduru.pdfIn PDF document text
    • https://indiantalentjunction.com/milan/media/30702416826.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134d5eca27b6---pevogebixinu.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/161379cc367ba3---98964440828.pdfIn PDF document text
    • http://anais.terminarz.online/kosmetyczka/krakow/files/lulasotizekevutap.pdfIn PDF document text
    • https://bookmyexcellence.com/bookmyexcellence/js/ckfinder/userfiles/files/wesuzema.pdfIn PDF document text
    • https://internationallanguagenavigators.com/media/vejamogifofogajanapif.pdfIn PDF document text
    • https://allianztc.ro/files/file/rovavoponuzogamasesilejur.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/8e7422d47d678a9350252fcf48483105/rozedipefemenepe.pdfIn PDF document text
    • http://chothuethietbi.info/img/files/35094686598.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/lodofinofon.pdfIn PDF document text
    • https://hebatkeren88.com/contents/files/taturudulelu.pdfIn PDF document text
    • http://cn-noah.com/uploadfile/file/fozegi.pdfIn PDF document text
    • http://sevinctekstil.com/resimler/files/velewoxakelare.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/29979140473.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/daxapupemopaxenagodezivis.pdfIn PDF document text
    • http://webinaris.eu/ckfinder/userfiles/publics/files/16328296166.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/kipajobin.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1612efca42b46d---monigigoporowotibufibi.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/mezufumogorimupotabowe.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_off0000e96e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE96E 17560 bytes
SHA-256: 6e27cfa65af0605f1be1f5aa60904df8463a833c0b783c2d548d748707d50c41
font_01_sfnt_off00011696.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11696 10652 bytes
SHA-256: 35976c76b957658763aa843c5d43ad5e14f4345bcc3952c973ae572ffe060fc0
font_02_sfnt_off00012ef8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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