Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c34ef9dc1a13c90…

MALICIOUS

PDF

103.4 KB Created: 2021-07-28 09:43:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 272512e8c8a6a8264ada6da56f128a96 SHA-1: 3aad7f083a47b7e37a21935da07143d71dd76af1 SHA-256: 9c34ef9dc1a13c90d60b99d61a74308e5aabb671f256ec20ab7b5617a29df98a
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, flagging it as a phishing trojan. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to potentially compromised websites and disposable hosting. The presence of multiple external URIs and link farm heuristics strongly suggests an intent to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://zhodnoceni-penez.cz/is/images/FCKeditor/File/xudomesofiluwuduwaji.pdf
    • http://aiswaryamatrimonials.com/fck_uploads/file/temekabesinatalus.pdf
    • http://aitrans.org/UploadFile/file/F1202106081224387859.pdf
    • http://tokyosushilohaus.com/uploads/files/41897293920.pdf
    • https://zemiigori.com/uploads/file/31352164154.pdf
    • http://2013.letnifestiwal.pl/ckfinder/userfiles/files/lufugiro.pdf
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c196823d489---86387333829.pdf
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/q2sqmk1p3952e144fiv5eqftds525e7k/9027074180.pdf
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099ed5bbee45---89641763849.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b310b832ec4---1856160311.pdf
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/44531b9216e590fab11a3f731c0ded49/rejobokasunatisujar.pdf
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f837beb01---vumewod.pdf
    • https://rubenoferro.com/userfiles/file/majileriwafite.pdf
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160844f5741f93---76348064464.pdf
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160989aa018359---rekudugupirilo.pdf
    • http://geometracosentino.com/userfiles/files/vipexesalojel.pdf
    • http://ayurvedicclinic.org/userfiles/file/61618021802.pdf
    • https://bhopalliteraturefestival.com/mpsdp/uploads/files/59646295948.pdf
    • http://funperm.ru/content/file/64080221661.pdf
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/lanuxaduxaku.pdf
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/5gssjjih3b0pbh5fgo4jdan0ca/1758443326.pdf
    • http://www.deopendeur.org/imgUser/file/45640085130.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a30b66f1613---49690708679.pdf
    • http://thankschicken.com/uploads/files/74641267733.pdf
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160a0aa52eedc6---dunuzitafe.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=star+trek+discovery+ship+pics
    • 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_off00012ee3.bin
b41b008572317bfac5e1c911129f1e4268e1b01e3c19bea3c01627b363b59d2f
pdf-font-stream PDF embedded font (sfnt) at offset 0x12EE3 10808 bytes
font_01_sfnt_off000147f9.bin
20482c64491fc1a6527c80e6eaa0fb874eac6eced9afe8e897ad423b39ff22ab
pdf-font-stream PDF embedded font (sfnt) at offset 0x147F9 17588 bytes
font_02_sfnt_off000175a8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x175A8 16792 bytes