Malicious PDF — malware analysis report

Static analysis result for SHA-256 927484792787b580…

MALICIOUS

PDF

74.8 KB Created: 2021-07-18 08:36:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b4cb79ff6364bcf0adca4668a6ed6473 SHA-1: 71763aa9c171389239251c41edafdcc10925d019 SHA-256: 927484792787b580ccc2e6eb384579087d4a3852487d2855498619a3d753d9c7
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm or phishing lure. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. The ML classifier and ClamAV detection further confirm its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076af5518da6---jugemipetas.pdf
    • http://akvatoria.by/UserFiles/files/74367259906.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606c95d77aa68---87295565757.pdf
    • http://drthchowdary.net/userfiles/file/67984324556.pdf
    • http://alexlunacoach.com/img/editor/file/wipizajajogabojag.pdf
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/f43896be7586f5e8bc9f0c612235ce5d/68465930021.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608fcdfc97bcb---kopibemumesukut.pdf
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/4870cc51e3493a3e596b01b7d455a36a/basisijerajupujezojava.pdf
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/jixanofivowanurebe.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16097c101cc14e---24733938910.pdf
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608f8b007a9c4---gupaker.pdf
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0687b9772f137cbd3dbceb8d00bbd678/pelukewev.pdf
    • https://mudrun.com/home/mud/public_html/ckfinder/userfiles/files/musozuvedelogefobe.pdf
    • http://51-lq.com/userfiles/file///73391184098.pdf
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073c72cce048---kikawepudovijek.pdf
    • http://xn--80aafmoni2biho.xn--p1ai/admin/ckfinder/userfiles/files/13917213720.pdf
    • https://a2designbg.com/userfiles/file/48022581951.pdf
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/n68d5e7po813cpg5rbdgl27g90/51464717473.pdf
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160988b10a0c35---zemevutike.pdf
    • https://nuttydog.hu/ckfinder/userfiles/files/16257003333.pdf
    • http://stardentalcare.org/userfiles/file/tavaweboguralewetozinelew.pdf
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/f53d6c109591c61cee3acc5556461a9b/31804241096.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=prepositions+exercises+for+class+5+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_off0000c43a.bin
71657faba28271e0db8a54f8a719fff3f7b27bb5a2c8671c2fb65e9468f2895a
pdf-font-stream PDF embedded font (sfnt) at offset 0xC43A 15776 bytes
font_01_sfnt_off0000ecb0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xECB0 16792 bytes
font_02_sfnt_off000104c7.bin
a1315feca9069bd69034b8f9c75565af5925ff78e0e1860deca3dbe84d0281bd
pdf-font-stream PDF embedded font (sfnt) at offset 0x104C7 10852 bytes