Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f573b9ef73f7402…

MALICIOUS

PDF

92.2 KB Created: 2021-07-06 17:19:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f0faf0ead2addf2ddba8894cebfa0494 SHA-1: 5691ec2e2b461bd9184dbd8a614df5964402698a SHA-256: 0f573b9ef73f740220ef12637a560eb0e9c61bb9d9923a4a53b9e6d2a88c0c39
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs pointing to compromised WordPress sites, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://crewmak.ru/uplcv?utm_term=herpes+and+brain+damage
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/b186af3f85138207af7a406c79720bd3/valobolutajuwujibisixo.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9df93eecc5---vebakeposigizunitelatod.pdf
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fb1d626f3463260c3b41330358e17e81/votonupukubilikoxanuzit.pdf
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fcab0a5141---tevutenimifadosifelis.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/63663c4ba03beca9440bb7bd0e58adc0/nefaxugutojut.pdf
    • http://odessahighschool1970.com/clients/7/70/70263b1be1b93b62200e198143f59f20/File/54083051967.pdf
    • http://uss100.com/clients/5/56/562308f4da1da23328cfd9e5c9f3e68f/File/94693108987.pdf
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/db1c7ea786a26bcfc05734335bda22a0/titudafo.pdf
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/moe8kviamrgvcoj46j263kjrts/tododogadolozevit.pdf
    • https://xo-sound.ru/userfiles/file/70020019042.pdf
    • http://hodinovysoused.cz/upload/file/42526940603.pdf
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/52e352c7c6fe154b66a57b4d4fa25f02/27718878399.pdf
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/l2ue2bq37b0mv00ur51imulcgq/bojobedimadam.pdf
    • http://stardentalcare.org/userfiles/file/vivoz.pdf
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/3d1c45cb4904e73050ae114e5aaa6eb2/menip.pdf
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/k1bqo3n09oj2phl27kadfndap2/84142423394.pdf
    • http://thallo-food.hu/uploads/ckfinder/userfiles/files/mupopokiwifiretunofux.pdf
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/qofvqukongstu61ohf5afdm840/jokuduruzasalipevumovolas.pdf
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/2b1e2fafc0239dd1870df9e3aedf925b/famukawifixa.pdf
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5050f538b9---venanatevuvudozerolalit.pdf
    • https://twr1115.net/files/fckeditor/file/sabufagaragagilufanumaxu.pdf
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba75d98a22---61784901060.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_off00010682.bin
afa57b1ba134fb0916714565ef83be510c9ed17d1709ef71f8e658b6b8be8dd9
pdf-font-stream PDF embedded font (sfnt) at offset 0x10682 10604 bytes
font_01_sfnt_off00011e28.bin
4f07eda76f245a863d6ffe91956e5f212f1bf66a47c5f094403d71bae2d90c37
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E28 17104 bytes
font_02_sfnt_off00014a3f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14A3F 16792 bytes