Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8f44af208d10981…

MALICIOUS

PDF

92.1 KB Created: 2021-08-23 23:00:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 851169346bb2f55009ae66154ba76239 SHA-1: 0af705612ebe36cd9c6d8f139cc1eaf61ca0ca7e SHA-256: d8f44af208d10981e77c2738ffd1749215d8761dca7a77e0bcdcccd412ef9f44
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to distribute malicious content.

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 https://queure.ru/uplcv?utm_term=born+to+slay+meaning
    • http://paoladebenedetti.eu/userfiles/files/fisojodalasut.pdf
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/58f48f200b3c5b316b66ad8ec2506543/zapuvu.pdf
    • https://mayphotocopydogia.com/upload/files/67405722595.pdf
    • https://rivieresoceanie.com/ckfinder/userfiles/files/xogoxu.pdf
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e45292e0432---98292349681.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf7f01d8eb---sudujafani.pdf
    • http://revistaspontan.ro/assets/ckfinder/core/connector/php/uploads/files/vofanufujit.pdf
    • https://almudenafernandez.co/ckfinder/userfiles/Files/41399347648.pdf
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/161130b563ee54---64179981106.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6584aede5---60273972110.pdf
    • http://arch-teh.com/pic/userfile/15346500393.pdf
    • https://srinivasagroup.com/ci/userfiles/files/86824758007.pdf
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/63f1219501da19c1e203e03b373b2a86/lerimipekeza.pdf
    • http://vetcasatenovo.it/userfiles/files/xotazavonirotege.pdf
    • https://bnbtravels.com/ckfinder/userfiles/files/figanavuburokudufer.pdf
    • http://duepassidalcentro.it/userfiles/files/lifesugobobejuxeline.pdf
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16079215097caf---tozepisomuvifalodosedi.pdf
    • http://dent-pro.cz/pic/file/80566189625.pdf
    • https://powermailer.in/userfiles/file/pidofovetidajaxo.pdf
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1610465b126d02---tukaxafinuxogasalizigoxez.pdf
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/3ca71ceb7bdac1bb87810071842ca503/liwimuvu.pdf
    • http://tauroconsulting.pl/userfiles/file/64908586285.pdf
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607a60a309912---vureromujefovul.pdf
    • http://ranchobg.com/img/file/zepujewebonizi.pdf
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/egquhsel5n39h4bdhklg5rn024/fumipapewo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0001141e.bin
9ee216fd7eada81bf303146412dda6174e3166587ff5eb5e06c99d9cc2a0d933
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1141E 17780 bytes
font_00_sfnt_off0000e6c8.bin
906a7e24a9d679d9f0253f78354061dc082659f5a2ee882e5766d9d510325c8f
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C8 17548 bytes
font_02_sfnt_off00012f9b.bin
c64fa240809e06c5fd303cd72b226a13e28ef174231d33741cc4224afd00e76d
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F9B 10616 bytes
font_03_sfnt_off000147ee.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x147EE 16792 bytes