Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cfc8d9da616fa14…

MALICIOUS

PDF

91.0 KB Created: 2021-07-23 08:27:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d219638b4254cad52714307b7bf4921d SHA-1: fa81ed3551e5b44aacd221b27d3e868a0bf8cb9c SHA-256: 2cfc8d9da616fa143b531e43f17bf8f224c109c23a1c4ac5eb120cd2cd845a71
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classification and ClamAV detection. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites. These links likely serve as a distribution mechanism for further malicious content or phishing attempts.

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://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/47a0d09de98f4988efa0c72b1e8d13e4/dufefetubefapojeparujas.pdf
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/dakivew.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2bab07f36---81611216046.pdf
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/a2acaaba841b8906234660958248db39/wugovotu.pdf
    • http://olgapolyakova.com/files/files/65912886145.pdf
    • http://mexxeopaint.com/upload/files/vegaladotonufunenugamesom.pdf
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/f984b9446de483e4034e1a1a2864061b/36215007037.pdf
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/2a8b38de43530acadc07d68e9d8d49b3/17383017040.pdf
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/2gf6fvleusvato70picnf11v5s/suramezo.pdf
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/339bf3494e3ac44c5ddaa589a6aaf0ad/befuxinapomuda.pdf
    • http://dbjhockeytournament.com/clients/f/f9/f9ff496842c877cbb4522510b668f2a2/File/80234748260.pdf
    • http://www.toeterloeh44.de/files/depumedox.pdf
    • http://drivingschool-brno.eu/files/63465625713.pdf
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f41dd98d90---62316782272.pdf
    • http://ingmarcofaedi.com/userfiles/files/54232574843.pdf
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/ecde08f8fa4eee0095f9cb08d5a29c46/teluzozavofipanuroz.pdf
    • https://luminex.pl/upload/file/womudadabijevexiz.pdf
    • https://olivierdaulte.com/ckfinder/userfiles/files/vasokajilipelupol.pdf
    • http://lamekatus.ee/uploads/ckeditor/files/97840180391.pdf
    • http://beijingxinzhi.com/userfiles/file/20210521174246_234556095.pdf
    • http://vtvxm.vn/userfiles/file/47228430191.pdf
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/96e86184c8c6aeb96b9ded227fdbe898/45764614391.pdf
    • https://okna-stv.ru/userfiles/files/mipunamadiborarabaror.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=bloons+tower+defense+6+mod+apk
    • 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_off0000ff02.bin
b4cd1f21d00c468e3f7c9fe76987e8e27b8703e7163cc518312d38284c5388e7
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF02 10968 bytes
font_01_sfnt_off00011895.bin
2c1ef7b8bcd52fd0922a105d8982c36241c9900c8ba8c4b1c2df364b276d30cb
pdf-font-stream PDF embedded font (sfnt) at offset 0x11895 17008 bytes
font_02_sfnt_off000144df.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x144DF 16792 bytes