Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e6e9c5758e86ec6…

MALICIOUS

PDF

86.1 KB Created: 2021-07-01 19:46:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9450557c8a49b0215e6d52865461e51a SHA-1: 907df260f94c208fd15ec699d34aacde0c99f8ef SHA-256: 1e6e9c5758e86ec66c3b48a6dab646da717a839958f448ab032d6c39ad47aa58
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage, suggesting it's designed to redirect users to malicious content. The numerous unknown URLs extracted from the document body further support its role as a distribution point for potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca7877d291---vilubekikedekisodos.pdf
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f719444356---89529692552.pdf
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16095edcb1bc8c---49958508201.pdf
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a125b6160---37325159421.pdf
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/llscgck2nsl48glu9lfkefva33/jajomodaralumexat.pdf
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/af26000462d53c3f798f0357e036e48c/57853633244.pdf
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16089166969d63---fanuzilubasutafobabasuza.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3ed6daf2b0---kosekakin.pdf
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/bd4b0d334d44657dac37abe2fc81b889/lomowemibokun.pdf
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607730caa6d99---2693735965.pdf
    • https://led7.ru/file/14658233007.pdf
    • https://arte-salon.ru/upload_picture/zoruzukuboj.pdf
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/0pljlieke881l0ocn1ufljtc5k/86971944946.pdf
    • http://macphersonproperties.com/clients/876251/File/kuwuvamubunuwedivigomami.pdf
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160782a64710a5---60351511411.pdf
    • http://egonseetour.com/FileData/ckfinder/files/20210618_01BAAE6657C88A64.pdf
    • https://stijsr.com/userfiles/file/49070835841.pdf
    • http://daphongthuyhueminh.com/uploads/image/files/89611127280.pdf
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9614c5c1c6---guzedawo.pdf
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/7ecd182cf13fa4174e80406dd0e3d573/kelavi.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e4de0c112---61931787198.pdf
    • http://inventory-acepipe.com/images/uploads/files/20166446835.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=the+drugless+doctor
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efe8.bin
d5f6c2e1d4e34020762b27b7b5ee6199d2578e656e0c2c8872f5b42bce922588
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE8 17028 bytes
font_01_sfnt_off00011c22.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C22 16792 bytes
font_02_sfnt_off00013439.bin
84444bac83e1ff8e7ecd23ce0673c3fae209e81c3d6dd90c05339a0c8a87452e
pdf-font-stream PDF embedded font (sfnt) at offset 0x13439 10356 bytes