Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa344877450f7995…

MALICIOUS

PDF

97.4 KB Created: 2021-09-04 23:56:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4d82bde85c18504215dfa4f27ab1cd1c SHA-1: be7043f038bf5b396ed8e77384521ff3bc3d896f SHA-256: aa344877450f799509e15ffe062c4a7172a86cd68167d8be00634f17bffc7422
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous domains, many of which are hosted on compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farms suggests an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/46176087056.pdf
    • http://tillmanfamilyreunion.com/clients/b/b7/b7385abc5988d1ee605fea7695e3d00e/File/mozazilakedulapal.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611d2018c45b8---51075294432.pdf
    • http://jtylek.pl/Upload/file/77963705233.pdf
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/4aedf3d5ebafd42262c05ffedec2772e/13929480012.pdf
    • https://pindimana.in/uploads/file/22588678217.pdf
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/0c99200229b92cd1c70fb6cdb877549b/vixowatawasurimijimemuxa.pdf
    • http://alnoorcity.com/userfiles/file/77705870994.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c692804a5f5---gitelidezuji.pdf
    • http://safaraval.com/basefile/safaravalcom/files/46617668653.pdf
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/2b92e5a8587601df58a6be27e7cd648d/gejotabibozutida.pdf
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16098ad058ee11---sixuno.pdf
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/iqihgbp10srun1o9odh4nm4he3/19842234068.pdf
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/41d97742aa0d5fc1590b742289c135fb/89578508853.pdf
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da30c9a582---taxane.pdf
    • http://resheto.ru/users_images//fck/file/32185364066.pdf
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edee3bde908---tisobejo.pdf
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160e01c04539fd---narureladimofaguvepive.pdf
    • http://stattus.com/assets/file/nazawemisuj.pdf
    • http://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/mokusigemo.pdf
    • http://vanhacollection.com/images/files/29357414032.pdf
    • https://kozhikodedeaf.org/admin/my_files/file/geketuposuvoter.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=tektronix+tds+3012b+oscilloscope+manual
    • 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_off000111df.bin
bc1f434bac47abd7c79b26c43acded90cad8fd5d45c08a1db4235ced742345fa
pdf-font-stream PDF embedded font (sfnt) at offset 0x111DF 11540 bytes
font_01_sfnt_off00012d24.bin
28d7aad17967fa7cc018ab8aab515b6068a8eb8eb4384c46853156f58ff34203
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D24 19380 bytes
font_02_sfnt_off00015fe0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15FE0 16792 bytes