Malicious PDF — malware analysis report

Static analysis result for SHA-256 68344be1ebc518b2…

MALICIOUS

PDF

84.4 KB Created: 2021-08-11 07:57:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b1e34da5ff5a490b07869a9df1ec2290 SHA-1: a6dfe8ffbfb3b71f4d0074b56c5d7eb7f1651c65 SHA-256: 68344be1ebc518b261d438646a0e7157b08d38fa79eedfa6c8d6f50e1dda5598
156 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 threat. It contains a link farm with numerous URLs pointing to compromised CMS upload storage and disposable hosting, likely intended to redirect users to malicious content. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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.
  • 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://simonhoirup.dk/userfiles/file/28924572227.pdf In PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/dd84ca7175c6c61f2c1d5cfc15a4cdbf/4139837276.pdfIn PDF document text
    • http://hasicimosnov.cz/foto/Image/file/nawawijesurejivafodatuson.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff0993621e---bapofidoke.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/78402749353.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160888847c1e1c---tupukudo.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f2b38d002b89f9ce3337725f0e899b0b/9505089965.pdfIn PDF document text
    • http://rokakisreunion.com/clients/a/a8/a85ca1e4cfc2bb88d767af442173b437/File/68175050848.pdfIn PDF document text
    • http://www.novosib-sport.ru/ckfinder/userfiles/files/42243073270.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/lepituzowamotimuwesub.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/neduto.pdfIn PDF document text
    • http://puntolinea.org/userfiles/files/vijaki.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/wumawatasadusugirowazosid.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9556b2c46---lolarovokalakenafexakobof.pdfIn PDF document text
    • http://elcampoeco.org/FCKeditor/file/wezewu.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160fabae6e84e0---84768946603.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/89547799556.pdfIn PDF document text
    • https://stop-remont.ru/ckfinder/userfiles/files/83393421587.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/d4aed1b9aea818aec4f5c39e2077201f/35762894955.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6b5f9bdf76---jebubibafarigava.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/k2dg2m6vd8q021rjorjifncmkq/gowevogizexemegi.pdfIn PDF document text
    • http://cpghollywood.com/userfiles/files/ruwemenoge.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/nasawosofujoxaleridezinu.pdfIn PDF document text
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/3109e336c4781239e3ef079ed20da7a4/6242942388.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb09b9c295---91209663470.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=compustar+pro+t12+manualPDF 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_off0000e5ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5CA 17056 bytes
SHA-256: 4053f4bdddc141da8ce8be78b28cca8793a6311ab76f6743d3b1d6e310915cd9
font_01_sfnt_off00011272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11272 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A89 10492 bytes
SHA-256: 5413fb822ad77b9708ec2e89f3fd62b174abfbc5c177c46f3663f0f7f18e5f56