Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d1602442b95e45a…

MALICIOUS

PDF

91.5 KB Created: 2021-06-28 01:56:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 95acaec8c9eccd5cc113c918d05a4953 SHA-1: da882d3011dad2cbc21ae15b9b0fc44f307ab50b SHA-256: 9d1602442b95e45a503a0a55c5de7d203a7661f0d34251ec245695d34030588c
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous links pointing to various websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a container for these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2df427b2a---zejimixumodimi.pdf
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16075cd26a9d21---28937382237.pdf
    • http://meta-min.com/files/pevanitixoweruzorix.pdf
    • https://hosvagyok.hu/userfiles/file/42626462187.pdf
    • http://tweedehandswikkelaar.nl/app/webroot/files/userfiles/files/12810713324.pdf
    • http://ttlh.vn/storage/ckfinder/files/xobetatebirifaxakalakoj.pdf
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/a67f00284a68da75377aaad325f371cf/jediwajum.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160737a3edab63---xivifininavebumagivago.pdf
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/b3baa48c91d309d92bc6f0a7eb19007c/pagedala.pdf
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609441a77be1a---75196965774.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/kajunisenoporemivaxoba.pdf
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a924eba1165---10777011553.pdf
    • http://karat-dobremiasto.pl/userfiles/file/44248778989.pdf
    • http://sahrugs.com/userfiles/file/jijegubujeba.pdf
    • http://ladyvenus.it/userfiles/files/lomavise.pdf
    • http://shannonlakeestates.org/fck_images/file/85790531442.pdf
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1608f72385de67---72417965267.pdf
    • http://topas.lt/userfiles/file/30864905945.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/bh80geti66qk6lld10tfdtldjf/21073229293.pdf
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/8b35c25c18c2fdfff00dac0167feea11/gevijagezinemesak.pdf
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/8d254a222d697537b87d145ea9226a2e/peposawuga.pdf
    • http://altinay-law.com/images/file/rupeligupagebefowusolur.pdf
    • https://ludifrance.fr/userfiles/file/4049370712.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=different+anti+anxiety+meds
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef82.bin
ba45d4cba5a9bc53c7b3a466acd162ffb97e31ed81a2060af0c94b64cdd65714
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF82 16796 bytes
font_01_sfnt_off00011ac9.bin
fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467
pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC9 16164 bytes
font_02_sfnt_off00013040.bin
ddab6ced5f384b4d84f0bd9ddacaea9c5dd0f3b44d96d3d7f1affb9f573a7564
pdf-font-stream PDF embedded font (sfnt) at offset 0x13040 10564 bytes
font_03_sfnt_off00014867.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14867 16792 bytes