Malicious PDF — malware analysis report

Static analysis result for SHA-256 73ae51e41df5a372…

MALICIOUS

PDF

82.5 KB Created: 2021-07-13 16:48:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 2a9270d7a88d1c9f637e981acde75d1b SHA-1: 7f71c768a2452b8a28e2f911c382a48988eac552 SHA-256: 73ae51e41df5a3725ad2ed49ee060a2381bed780d87746682c4306e9205d181b
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The heuristic 'SE_ENABLE_LURE' indicates the document likely instructs the user to enable macros or editing, a common tactic to bypass security measures and deliver a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://allytemp.ru/uplcv?utm_term=mean+corpuscular+volume+anemia PDF link annotation
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/7cd6dec91203c581c814c131f0c1ad42/95463169110.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e80d0292b2---81147922452.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/249371d3afe2620f084f34cc3b122442/84337201326.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/16082b8d6db874---jasugudadabew.pdfIn PDF document text
    • http://falconartistmanagement.com/ckfinder/userfiles/files/zofedolebuxer.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609498d7ae18e---tidanimokeb.pdfIn PDF document text
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/fca8e0e2c6ad24779434d07408a04605/joxawana.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/60531516688.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5a8ec4bdc6---10766711536.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/kozozuro.pdfIn PDF document text
    • http://jarosi.hu/files/file/beniduwojatafapufibeliwel.pdfIn PDF document text
    • https://xn--z4qq44i.xn--kpry57d/upload/actfiles/9888374425.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/mexevawu.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/b3a8e48dfd570fbec204214952765976/kofuxirivuj.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/fe4f73ab8e6af00b4c9d807a4a844ab0/15233468823.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/33975616390.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/kqhvp2dmv8mk6p70kbs03da6e4/radatulumetizozexez.pdfIn PDF document text
    • https://thehideawayresortpattaya.com/userfiles/files/91606863854.pdfIn PDF document text
    • https://bnovum.hu/downloads/jajezilazifugamikuli.pdfIn PDF document text
    • http://abwingssuffolk2.com/uploads/files/nabasasowemowi.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077d6c134019---71480681843.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/fijuwoxafogovoxezuso.pdfIn 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://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_off0000df7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF7B 10596 bytes
SHA-256: f05ffc6180f6514709364bf492dc1a42421db1418e9efe5ca2b2ae19b78e46c6
font_01_sfnt_off0000f7a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A4 16892 bytes
SHA-256: aa44e3b6335bc1cca8ae28ceb23e4c186d2017f6ef220f11370c28b7ae9c4d98
font_02_sfnt_off00012313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12313 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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