Malicious PDF — malware analysis report

Static analysis result for SHA-256 555acae3f585c210…

MALICIOUS

PDF

87.6 KB Created: 2021-06-28 21:03:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 418097d2c4ac12fecc2abb15df458f79 SHA-1: 3f8848689c4852db3ff73d6147a1c097a2e0383b SHA-256: 555acae3f585c210e4333a11e198846c70d258cc72442a2c99d26224f785e936
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating it's likely a phishing or trojan delivery mechanism. The file functions as a link farm, containing numerous URLs that point to compromised CMS uploads, suggesting an attempt to redirect users to malicious content or further stages of an attack. The presence of multiple distinct hosts and the use of disposable hosting reinforce the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ad904744c5c---13841483555.pdf In PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/b77326a5f2afae1117cd820b4897be6a/23440179808.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/95dd53944c17c5f1a5736ec709b5435e/81816103581.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/aeed5effa61bd5c56533c75e55f36d92/wiwiw.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/77e87efc2404615cf9cc1de068da9f86/35964745805.pdfIn PDF document text
    • http://hilltop1976.com/clients/24685/File/rexedoforiweze.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c5510fecdee---12173233383.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/75383513588.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/12d301abd6e775d19504ff5898066ab6/58429653568.pdfIn PDF document text
    • http://restravel.ru/ckfinder/userfiles/files/budulutosomorexo.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/687a4e962822a8f2e5036bd5c2a946d8/8292780927.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16093f6953a5dc---66341415209.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/240bb9224d1cbcaa85b0da79256657e4/44483508054.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160afab01153ed---84503366228.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/d1e9b7dc3a1881b357d5aab80570bdc7/nonamuporenebomugofukox.pdfIn PDF document text
    • http://restravel.ru/ckfinder/userfiles/files/13911192579.pdfIn PDF document text
    • https://lavaecucebrescia.it/file/761750299.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608f9cfbcaedb---sunelopa.pdfIn PDF document text
    • https://thediamangroup.com/_images/files/toxiravixavumofevoxi.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a47dd86494e---46493541170.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/eff5daeb293528d8b8473a6939770a9c/52428367526.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/55b5fdb46f2c5051cf329cabacce06a5/87211713473.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16087dc9c8f241---33158306220.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/fifoz.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/19d3198n0s0smct4c9lik0jdc7/lelepomofarubuw.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/ako6kqkocucbiil9c8a3evpodd/vuviragujazape.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ad22edb2d03---83585274418.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=feather+tattoo+designPDF 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_off0000f3ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EE 10460 bytes
SHA-256: 3bcab02ff253d6b797afd2b46fc7a1935877791e1a77042e3090ea19b1fae992
font_01_sfnt_off00010b64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12376 17548 bytes
SHA-256: f0b045d4f18a05d9e38b544da44990b14469afca819e8dea5409d80126bb0544