Malicious PDF — malware analysis report

Static analysis result for SHA-256 4109834ddff8b23e…

MALICIOUS

PDF

92.0 KB Created: 2021-07-19 18:28:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4c66cc2248f65edc5e7728975ba84d41 SHA-1: b5702a23a76951cd80cb967e6a0bbc057997c671 SHA-256: 4109834ddff8b23e3f7cab57e77bc632f55607da06c0114b06c0d3fa270b89b3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm with numerous URLs pointing to compromised WordPress sites, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support its malicious nature. Although no scripts were directly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c261a6ee0c5---jadukegujatevaju.pdf In PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608321adcc86c---97326004117.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/kasimiwoti.pdfIn PDF document text
    • http://tamilannuaire.com/var/www/vhosts/vps296430.ovh.net/tamilannuaire.com/images/file/rukonikijipe.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e31e61164---92474504073.pdfIn PDF document text
    • http://rzn-house.ru/upload/file/sojejoliwezojase.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609088ea2dd84---xenixupinuxebofa.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/zisevejeti.pdfIn PDF document text
    • http://proxima-design.cz/files/file/lanujigirarujizexo.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/77279483016.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/37j792efplb6dessa614cdu3q6/xukonaviwawofa.pdfIn PDF document text
    • https://eghamatkade.com/basefile/eghamatkadecom/files/32345955089.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8b83a547a---fobemimof.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0feqd0uru1h9kdl6qh0u51moo5/zufenasatawoguvekem.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/50bd88b4b2422de0a262f53f93d74591/88014232313.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/rurbffc79u2hpk2ibmi7iqhsa7/81750425837.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adc071cef7c---gosoxavusifagufukore.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/431472917361b5216b6369f163f3765a/sufuteganumivu.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/fovafovudigif.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160807c8b5379a---lilijajawuzajaraxolok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=bloons+td6+updatePDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF995 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000111ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111AC 10516 bytes
SHA-256: e0257e03ccf396b91a8519cca3862f3a662b14b6c1148786b123874c88d0e9bf
font_02_sfnt_off000129c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129C3 2160 bytes
SHA-256: 37152d19e110259e1a7542e959dd63b0166cb66739f48510bb38e63d3d1f8b26
font_03_sfnt_off00013353.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13353 17880 bytes
SHA-256: a82ceb67ac8038184869ed82d0f3eb527e7253b95f65fe2fbb345ccbb45257cc

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