Malicious PDF — malware analysis report

Static analysis result for SHA-256 b29ce524b189f163…

MALICIOUS

PDF

72.6 KB Created: 2021-09-21 21:29:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1f8d5b1477f991ff1c8544f3f133fe86 SHA-1: e091127d0022946c135cb7b14088d0908afe6c83 SHA-256: b29ce524b189f1636390ba27422e68bb988b354ccd05f0b2d788788259df1c0e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs that point to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The presence of these links indicates an attempt to direct users to potentially malicious content or phishing pages.

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://medvor.ru/uplcv?utm_term=ello+life+apk
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/e083c51d8d1bdedb039c55f0b815d5fe/85294252908.pdf
    • https://madspot.dk/ckfinder/userfiles/files/tofunogiluzuw.pdf
    • https://atamergranit.com/userfiles/file/33330333402.pdf
    • https://triyoga-tv.ru/userfiles/file/53742246639.pdf
    • http://feldbach-tourismus.at/files/rifaw.pdf
    • https://fotokeramika.bg/userfiles/file/19718363956.pdf
    • http://neboskreb-irk.ru/uploads/userfiles/files/30893123628.pdf
    • https://www.aukuras.org/ckfinder/userfiles/files/90761674258.pdf
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/1puhvef6hpvomp69j74tktlm3f/44364784846.pdf
    • http://alibabashipping.com/userfiles/file/3179468014.pdf
    • https://atiksigorta.com/files/75911898161.pdf
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16133f3e480ab1---63859172804.pdf
    • https://www.restaurant-latableedevercel.com/ckfinder/userfiles/files/13844150309.pdf
    • http://matras-devison.com/upload/file/gozetepabejenalomusufefo.pdf
    • https://digireg.nu/upload/65689185189.pdf
    • https://sieuthimayphat.com/ckfinder/userfiles/files/73269056985.pdf
    • https://ikorti-iao.com/userfiles/files/betitiroredesegivabudemut.pdf
    • http://chhattisgarhsanskritboard.in/sharpinstitute/images/files/peporixusuwadunekaja.pdf
    • http://chinhsuasolieu.com/media/files/52710601475.pdf
    • http://recrute.fr/files/files/17919115070.pdf
    • https://textmakareknutsson.se/upload/image/zajororem.pdf
    • http://61kidsclub.com/userfiles/file/tezafegin.pdf
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16143eccc02662---35085128431.pdf
    • http://logicparcel.net/uploadsEditorfile/gifegomafojobekumanoziso.pdf
    • http://odontoflash.eu/userfiles/files/76702153722.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bc6d.bin
cc72ec19515739fec668ab2e5094ccde97237f0211bd4ff64d6a698586c40ec8
pdf-font-stream PDF embedded font (sfnt) at offset 0xBC6D 9956 bytes
font_01_sfnt_off0000d284.bin
79f5021815462958c7ddd3b57a42482eab063f6c6ff5a7d84b08db7d967c699a
pdf-font-stream PDF embedded font (sfnt) at offset 0xD284 16456 bytes
font_02_sfnt_off0000fc97.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC97 16792 bytes