Malicious PDF — malware analysis report

Static analysis result for SHA-256 9898d5a8093a212a…

MALICIOUS

PDF

82.9 KB Created: 2021-09-04 09:02:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1928c11db2cade2b789826539ab0f7ad SHA-1: 23af6eb13ada8d6cafbfc7b80fcd95e91e002b98 SHA-256: 9898d5a8093a212af6afdb8af7a9b53bce5e4d2b51ed3b8c782b46485d55d84c
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it as malicious. Heuristics indicate it functions as a link farm, pointing to multiple compromised WordPress upload directories. These links likely serve as lures to phishing sites or malware downloaders, aligning with a common phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16126d1b874608---43012937361.pdf In PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/9d83abf232d90e143b8f302879fa020c/97394451058.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16086305c58f79---disawezatazivunilax.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/0243fdd501535b5b9eae63423525522f/kawazabigojufudagi.pdfIn PDF document text
    • http://sicompk.com/survey/userfiles/files/44598192753.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/maxasotew.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6301ae5f10---48209385714.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160baec9dd692b---vatunazisazu.pdfIn PDF document text
    • http://photou.cc//ckfinder/userfiles/files/54634583627.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/57705478038.pdfIn PDF document text
    • http://funagamex.vn/PhuongNamGroup/userfiles/files/90334412442.pdfIn PDF document text
    • http://rayanchem.com/d/files/ranamodufuxumusobanumod.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087c434769db---napowejuxaravulaxarilofif.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1608db112e283a---zobaxupalu.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/88a8fc8845c78f38789ddf36cd043d4a/panopapib.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/4f9566276abc5b6926db69f8047585aa/lamemedopu.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f8ef276d586---vawuletowubumulalujoluwo.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/1eccbc530975afe73f33e1cbfca26303/kukiweradofolutixik.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/kotiwanegejo.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbfdb2cd1db---47332455236.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/be2cef79fa0d4e9a59292abab872010d/vonopa.pdfIn PDF document text
    • https://xinpayflow.com/ckfinder/userfiles/files/98427148132.pdfIn PDF document text
    • http://ozkayalartrans.com/userfiles/file/47024773281.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1610e8db901b9d---43501937124.pdfIn PDF document text
    • http://hookmyweddingup.net/clients/73542/File/lemam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=snugride+snuglock+35+platinum+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_off0000dd83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD83 17872 bytes
SHA-256: c6c690640f483c89b3cb3f58104e847a039e4349facdea1c522aa46b4c138093
font_01_sfnt_off00010b54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001236b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1236B 11428 bytes
SHA-256: 476c4d20e5cdc8899637295d0fac7438719d266398ab84af3c8ffb6808063758