Malicious PDF — malware analysis report

Static analysis result for SHA-256 b354c8eb62484a2b…

MALICIOUS

PDF

102.3 KB Created: 2021-06-14 00:29:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: c997dfd08d485fd0442e3e221b456e72 SHA-1: 837c61073aa012caa315d4dc8dcabf2a74232cec SHA-256: b354c8eb62484a2b61475a63b0b0baea48ec99fe455020cbc21cdd11d73870bc
196 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, exhibiting characteristics of a phishing lure. It contains a link farm pointing to compromised WordPress sites, likely intended to host a password-protected archive, a common tactic to evade gateway security. The document's structure and embedded URLs suggest an attempt to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://ketchas.ru/uplcv?utm_term=bahnschrift+bold+condensed+font+download PDF link annotation
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/39d4d558a521b53a01f55d9497be97cf/gabitujetabutofa.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/ef4425b21ec906d51b97486ce31a632d/21272755575.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-4-30/20210430204339606742.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/3f425c193839a7fa7b167869c954c7d4/33777273714.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608909fc98e60---66660373827.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0939ca54ad---41667410831.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/nabage.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/ba24d38df80df1ee1fd49b15a4848b2f/10762193157.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/0f51d673fd9a1b40ad7b429615d635c0/zutofemitox.pdfIn PDF document text
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608118f08c48d---mamogukefuwovigaxevevilag.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/tosefudes.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4ae4671aa1---42583337671.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/d80130b47acd341ad19133c579095794/11118148419.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/47670690581.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file/%5C/80475312352.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/olj2va03p8pif17l8i84hfbcol/kifuxatadonadelupa.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f37755853---talelidebaninewunelo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn 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
font_00_sfnt_off0000ebc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC2 20492 bytes
SHA-256: 45d1dacb214dbbd7f2386b5e1cc1a88b702d7c12d816aea2258cee74c5fff048
font_01_sfnt_off00012c0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C0B 5180 bytes
SHA-256: 50a7a69b5a84069df5134cdd57892fd6cefdf91e7b790c9eaf0a8884f69137d4
font_02_sfnt_off00013d9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D9C 12060 bytes
SHA-256: d83ed3bd9d53d162a8456082610ad28ce41fefbb4531b208c48caa0981a9c0ce
font_03_sfnt_off000166c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166C2 16300 bytes
SHA-256: 7200305fabe2a58003f93db40b54f8f68e8d449aff16dcdef10f24fbffbe74c2
font_04_sfnt_off00017c60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C60 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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