Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c36e6a494524680…

MALICIOUS

PDF

109.5 KB Created: 2021-07-07 23:58:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0fda5b390dcab9a45817f429ee727854 SHA-1: f0547e63b9a96b2de113ed7469067c5f061e4812 SHA-256: 1c36e6a494524680808aa49d3f7c44af69678563a4d09d007fa2e27c2b3d6a80
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to other PDFs hosted on compromised websites or disposable domains. This suggests a phishing or malware distribution campaign where the initial PDF serves as a lure to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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 http://bertrandetgastineaudesigners.fr/userfiles/file/lomodisavonigit.pdf In PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8rfiq4u2r29daseebncdsoptj5/40830408403.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160894bf50360e---loderitujas.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16070edf3c301f---savutovosaveremesopuwil.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b98601f094c---gigoxofufomoridomamemok.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/nozirudinoba.pdfIn PDF document text
    • http://93564497.com/userfiles/bakidazipudodaxupezutawag.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/jororegarareve.pdfIn PDF document text
    • http://st-communications.com/ckfinder/userfiles/files/jakotibidawomutadoli.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/80a6095dc71707d2bdff92701c72983f/gedepipemo.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/87260530442.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160824a0359d39---39632584494.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/cj7922hsphvgd7tc2oc0v6ldse/11476438678.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ad893bb0a09---taparewikivuf.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/leribupafawazal.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b86c09327db---89726954105.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/28954240834.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160e1d3f348e53---15454530907.pdfIn PDF document text
    • https://plasy.com/uploads/file/8610433328.pdfIn PDF document text
    • http://rogo-rotterdam.nl/files/60377049940.pdfIn PDF document text
    • https://fruzsiflame.hu/userfiles/file/23802125876.pdfIn PDF document text
    • http://sns.hu/_user/file/nanameravagimuvupaxozis.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/wawupewikabasikanobew.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c856a2bee0---45218758708.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/wuvobigimewaritifukiv.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/rowisabadud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=bse+new+high+lowPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14876 18692 bytes
SHA-256: f552fec96b017614c99d377e3f727fb5cd23f65fabacb115cf7015e739660c9c
font_01_sfnt_off000179a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x179A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000191b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x191B8 10168 bytes
SHA-256: ee51b6cdb03678672513412bca140e16c1222792c095355c1134f1b25dda946f

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