Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fae8d71d555c791…

MALICIOUS

PDF

112.4 KB Created: 2021-06-10 08:55:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 0f1a98a7249a71b820c8f663515c119f SHA-1: 747b8589911ad9687705134804ec88abf14dae27 SHA-256: 8fae8d71d555c791d72e0fadc0886c0c6d9c1296c57ee16ae21a031776546aba
156 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to download potentially malicious files disguised as guides, hosted on compromised WordPress sites. The embedded URLs and the structure of the PDF suggest an attempt to trick users into downloading further malware, likely through a spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://queure.ru/uplcv?utm_term=10th+english+don+guide+download PDF link annotation
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/i6g5m9bd83h7ceh7usv3aergv5/jikisazutigura.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/96fe874227da313d99b0b813aa14a330/narumijunu.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/44fa3a7fcc8c847017477b495cadc7e3/98516353541.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf416ae576---tuvimebunatopaw.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/44b66295897ee1d2e79cdb0000032fb3/jaxiporivirulewisure.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b54b83e13b---dedanofukoramebok.pdfIn PDF document text
    • http://baohanhranghm.com/upload/img/files/26095798312.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/96043805568.pdfIn PDF document text
    • http://retroldn.com/userfiles/file/89019594911.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609442ac00e34---jezuvetovibonuzebukikofa.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/43380081032.pdfIn PDF document text
    • https://nasroglobal.com/userfiles/file/sewavamutolonilaxaf.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/82144887676.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082313fd9287---zofurunowitofu.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16097de2589495---xewigizif.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00014c1c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14C1C 21104 bytes
SHA-256: 97e938a16279aa5f1af98c18c66430710b61e95c44e6f3fadd6cbc64b092741b
font_00_sfnt_off00013a66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A66 5184 bytes
SHA-256: a67498f026049ca0232ee8c3b0b2d792f02cfa8f63d118caf535a8e967080450
font_02_sfnt_off00017977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17977 2116 bytes
SHA-256: 316f78c6e162999e43ccb83d429ef85c46045bf1ac59c77d169faf589ecd4eba
font_03_sfnt_off00018321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18321 10876 bytes
SHA-256: 454986bdfc852fb0e91bf9db22195a440987e8fa3c17a1f5391dd7d9054fb535
font_04_sfnt_off0001a868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A868 2832 bytes
SHA-256: ab0b30550c16f0218ea180a56450acc25083be48fb805cb0f6f475dfa13b8319

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