Malicious PDF — malware analysis report

Static analysis result for SHA-256 4efee2e23f93a759…

MALICIOUS

PDF

86.8 KB Created: 2021-09-05 22:59:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ab8ad4d07dfae4d869754b9f8ca75c56 SHA-1: cd7322d1bdd14dd4b65274ac67a6e7bb61a37eae SHA-256: 4efee2e23f93a75930bd6c81ada3254bf3797f2a723815ffce71cb61a3ed1ecb
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external sites, many of which appear to be compromised WordPress uploads or disposable hosting, suggesting a link farm designed to distribute 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 download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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
  • 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
  • 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://laborke.ru/uplcv?utm_term=the+little+book+of+rust+macros+pdf PDF link annotation
    • http://ferrocom-spb.ru/userfiles/files/dulinabesemolilutodapu.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/50159117130.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c80a2cab2---pinefilum.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b4973c41ca9---gosimimujokavinedexavuled.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609208a5ace48---damigusoram.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/pumifozeramo.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/e36897897c4ee997a39855db6a118e5a/25758607661.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160928642b64a7---losisiwubosibonaguwijosa.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/16084a2d5edb4a---95592564974.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/81642325467.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/9k4h5l8lpi300tk89lv2u6abf4/65298223034.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/linatisimovukodemito.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/45371691894.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/novugibapin.pdfIn PDF document text
    • http://lex.tj/img/file/zupategolevorebukolazera.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/kawiz.pdfIn PDF document text
    • http://stringpoets.com/userfiles/file/53379827516.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/16913150641.pdfIn PDF document text
    • https://familienarbeit3plus.ch/userfiles/files/58457009435.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610b0e514153a---60272868593.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16091ca8c251b2---bosajixin.pdfIn PDF document text
    • http://findacommodity.com/upload/file/74821027642.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093195266411---mixixazopumovawoduvujafet.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/2bd3705c708d9b7302d880906b9a097a/zurexokuxejed.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160985b0a6a6f7---renizuzibudebemakaxoxago.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF53 11076 bytes
SHA-256: d1b331a16393406c8db2bab83cb69fb873c44832a4fcd5a4d2cc9e436dd893dd
font_01_sfnt_off0000f8f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F2 18444 bytes
SHA-256: afdc403c52ad1c3b0c225adc9938d77437c0ff1b799c5fbc311f66e8a347afa5
font_02_sfnt_off00012a54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A54 1860 bytes
SHA-256: 562d39cc93351683f3420870a5578826c1285db13c691c08f99be18f4980e560
font_03_sfnt_off0001330a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1330A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.