Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6d1b9c9d343527d…

MALICIOUS

PDF

77.2 KB Created: 2021-09-20 10:35:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a8b98689f9b61e9e718e9ffa889a6a5f SHA-1: f47747383183566d690b24ba031fc354eff152a4 SHA-256: c6d1b9c9d343527d72c36dba7dcad5e932b818fdf14e8c6000cca0a465cd9a35
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many pointing to compromised CMS uploads, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://wastran.ru/uplcv?utm_term=does+the+irig+2+work+on+android PDF link annotation
    • https://businessincasey.com.au/application/third_party/ckfinder/userfiles/files/vijunulitesilepezole.pdfIn PDF document text
    • http://bud-drog.pl/userfiles/file/vosolavajisosejax.pdfIn PDF document text
    • http://webbyshoe.com/fckeditor/userfiles/file/giwidinesiwowutawajid.pdfIn PDF document text
    • https://kungfuclasshongkong.com/louis/taichi/ckfinder/userfiles/files/puminavaxafukafokegilu.pdfIn PDF document text
    • http://xn--b1akwe.xn--p1ai/userfiles/file/jidaweworufujamixoli.pdfIn PDF document text
    • http://lagostena.it/userfiles/files/suvit.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/36b11686ab4c541141ef5725870b4463/zevesadoxeburevuf.pdfIn PDF document text
    • http://didula.com/img/file/zobegufoteti.pdfIn PDF document text
    • http://capitaloffice.pl/fotki/file/kuzevenukilukipunofivire.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/49278329693.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9c5946fd1---30549221498.pdfIn PDF document text
    • http://fu-xin.tw/uploads/files/202109102238342672.pdfIn PDF document text
    • http://aal.tw/uploads/htmlupload/files/30104768628.pdfIn PDF document text
    • http://kajo-frings.de/userfiles/file/kofinati.pdfIn PDF document text
    • https://illustrations.noche.fr/images/files/nalafokoxobara.pdfIn PDF document text
    • http://195exim.com/datas/files/rudajozevawig.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/48358511268.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/16136b923abf2f---40219048311.pdfIn PDF document text
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/1370422884.pdfIn PDF document text
    • https://tckontrola.hr/files/wuketa.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/q6bj8c25ss8o1r4bcn9il4bdnr/viposaxetigururapego.pdfIn PDF document text
    • http://slesnick.net/userfiles/files/15872718310.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/dtievrp70vnoqvcsj42236igoq/tofujuwajawabawor.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/39db8ba5122d4a722eb2cc9a00c005cf/doditeto.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_off0000c7d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7D8 17844 bytes
SHA-256: ab658bb872ee43b2bfe9c9dd962b30fbf3c148549cb4c70b6fbb29f5797fdc98
font_01_sfnt_off0000f641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF641 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E58 10780 bytes
SHA-256: f5a07a983d07119ffb82cee5e6f5bdbb651a9b38a7a4c8abdc44994e44cdbefe

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