Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7c876ee7ac14fb8…

MALICIOUS

PDF

84.7 KB Created: 2021-06-30 03:12:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6a89e93cd53a7ba03b544a9234b99443 SHA-1: 9499a354606bb057d0ecafbc48f49a52dba6d276 SHA-256: a7c876ee7ac14fb8aeb718116b7a9cfa72d8dc015edadeb7ed6a66aec9ceac4b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

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 https://archism.ru/uplcv?utm_term=acceptable+hdl+levels
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/0s4dmdkgvircsv71j4l3cd2lt0/vikotejijanagazesumapofon.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608310f55f2d1---gasifinumi.pdf
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba8e796a287---22928399480.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f763db663---kalenidiges.pdf
    • http://angelescare.com/userfiles/file/nexetadu.pdf
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074c921867f3---jogexomapogiju.pdf
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0d5b089d3---63677859169.pdf
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/931cb7114dd650424a944d8ce8a0f487/17958532537.pdf
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/kh4r0jt2urfhugdo7lhoa0enna/65830372613.pdf
    • https://przyklejki.pl/userfiles/93778910958.pdf
    • https://rtvpuls.com/ckfinder/userfiles/files/23146136720.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160736b25c8f65---nunupidoreti.pdf
    • https://presentkompaniet.com/img/content/file/47778947414.pdf
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16093b5af9ee0c---natajoposimuxiseza.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b215193d162---63717838616.pdf
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/gpinkuba76upkue6oensrdf6c4/suziligevimu.pdf
    • http://riskhedgetech.com/uploaded/file/21256170306097b4b4f2c1f.pdf
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/ov1b61nvcu8qg5pvq54mf0d7a7/85525143502.pdf
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/f7ed44eebd7ac678ecc98c1cc0644d43/daribodebanejuzedekuri.pdf
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/aca74f3f30edbb92267040264af3f97f/toveruzirinojumefodik.pdf
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160c70a4bb5cc0---vumokokezilewitexepu.pdf
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/01f3c3edd2aa9c89cfc3b594fa2705c6/41687041802.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/uk3kfdfh506m4c5gekl7sgd5ha/poruvopelevi.pdf
    • https://broadcasthub.com/ci/userfiles/files/29243784235.pdf
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/1296bf4f50f1bf130177335e26deabf6/8372367994.pdf
    • 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_off0000eac1.bin
610ca2ace56e8fe19b5674043d90fa9cab592791724ef24404d34cc6d66074e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC1 16720 bytes
font_01_sfnt_off0001160c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1160C 16792 bytes
font_02_sfnt_off00012e23.bin
7f55f01f751c48a702861e5457b495901b9d35e98b3f95a876399ec09b86453f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E23 10384 bytes

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