Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a185b2eff7d0623…

MALICIOUS

PDF

74.7 KB Created: 2021-08-05 08:45:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 90efe2128205a389727d69531397f799 SHA-1: 69f05c95bea2684f3b5cc0e0ccadb53269d9f161 SHA-256: 7a185b2eff7d06235fe3f4c949752bd2e41fa1882f8a334271d3224a237c91af
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple distinct hosts, many of which are associated with compromised CMS uploads or disposable hosting. The embedded URLs suggest an attempt to distribute further malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://jfe.hk/userfiles/24686367846.pdf In PDF document text
    • http://drapa-technika.cz/UserFiles/File/davem.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085fb87dff74---rexubixanojeron.pdfIn PDF document text
    • http://archifolder.com/userfiles/files/94371894500.pdfIn PDF document text
    • http://mateuszkucharski.pl/admin/file/23427799813.pdfIn PDF document text
    • http://textstricker.de/benutzerdateien/99018718345.pdfIn PDF document text
    • http://szermgrt.hu/uploads/ckfinder/userfiles/files/jivonolipugikutobesowun.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b88f69e999---tazivobufekurebel.pdfIn PDF document text
    • http://sequirk.ie/userfiles/file/65136369582.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c18e9824f29---mefalugefurumetun.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///23974807252.pdfIn PDF document text
    • http://klefmarken.se/upload/file/taxesuvaki.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b8ababe67f4---rapufopodoli.pdfIn PDF document text
    • http://wonderful-foods.net/userfiles/file/semotabonologe.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/cdmviu8mpsg3m30kt7cd2gml64/koxogar.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/58204999663.pdfIn PDF document text
    • http://yuhongzg.com/d/files/munufunefixajosifixajawu.pdfIn PDF document text
    • https://pacantioquia.org/aym_image/files/91065169802.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/800cd95d8ea3213dbbd4b4ecd7f45675/94327299822.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdeea227d5---tatevezejudeboxufojonupim.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d535ca9a61---52467727842.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/orihsg1hcnjdt89d8caiie8kol/wonozuvakikuk.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607807d9359c6---81359528021.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d543ad130b4---92123007393.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=world+religions+a+voyage+of+discoveryPDF 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_off0000c2e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2E2 15620 bytes
SHA-256: 079eb1dca735ca9829a483be914bb3f2ac5753a1ecf3daaa557c4b6e2b050439
font_01_sfnt_off0000eaee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAEE 10724 bytes
SHA-256: 57fd9108aae34738cdf0a5ff36635ce9f878beb264117c07bd7fb3e25147d82f
font_02_sfnt_off0001037e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1037E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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