Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d2b72821cace80d…

MALICIOUS

PDF

85.8 KB Created: 2021-07-05 06:43:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 44f79a35e043a4ac73209e7bdbff82ac SHA-1: a833b40b6e8fc15eaa2bb994563b16caf94fe521 SHA-256: 2d2b72821cace80de5254f8f17d03d46198417e505e030e0a114817ce8e17985
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute further malware. The presence of external URIs and the ML detection strongly suggest this PDF is designed to lure users into downloading malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://ukrainski-rosyjski.pl/userfiles/file/nigakumobudewejisax.pdf
    • https://angkortaxiservice.com/userfiles/file/64633778730.pdf
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/16073bbd9c751b---18109051361.pdf
    • http://mentaplywood.com/images_upload/files/movamedoxobafutoremomu.pdf
    • http://tuning-zone.eu/userfiles/file/sozadexo.pdf
    • https://faceless.me/userfiles/files/sotixa.pdf
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086a4ab612af---bamawozo.pdf
    • http://nakatka.com/files/file/24001600403.pdf
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/2qhh1dovnfoa6gh9qjedd7n918/4540326170.pdf
    • http://artistalexanderkanevskywinnerinternationalaward.com/clientMedia/file/5314931652.pdf
    • http://acmemask.com/upfiles/editor/files/96498832094.pdf
    • https://zold-kommando.hu/files/96404596982.pdf
    • http://mpu-beratung-brendle.de/userfiles/file/59794189272.pdf
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c2a4ab34c01---29883499410.pdf
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16072998381000---wazudekalawijolorez.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/6ea484acd49464bdbb6b371cf6ebbec5/54808811776.pdf
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff817b3107---67616141516.pdf
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d949a172561---34510777167.pdf
    • http://tdbakademi.org/userfiles/files/tibine.pdf
    • https://ntct-dz.com/ckfinder/userfiles/files/22791801817.pdf
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/hv832ghtaal86fd4lhb017s4u4/poxameweg.pdf
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099e31a90817---41021807981.pdf
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081966f8e596---46819383600.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=high+school+musical+3+full+movie+123movies
    • 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_off0000ea70.bin
c57d00ad656d038fdb1e9bb8ce18dfb40e09f70b6108e0366064193033257ba9
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA70 17360 bytes
font_01_sfnt_off000117de.bin
327466118dec244c5ac7d713fa25c2b1e6f8074b0cccf5f4c0d38be1332dfd92
pdf-font-stream PDF embedded font (sfnt) at offset 0x117DE 10980 bytes
font_02_sfnt_off0001317c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1317C 16792 bytes