Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfbd1558b7da9e56…

MALICIOUS

PDF

86.8 KB Created: 2021-06-25 17:20:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1faa45f54e18b41d1b6dd2e47aec0827 SHA-1: 3a943399b90d49cf5fa9783262e22dbbb5f1e6cc SHA-256: bfbd1558b7da9e5605bd1efbad2862a2e90f24082647224da8926a0beaf6a4a0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised websites, indicating a link farm designed to redirect users. The PDF structure and embedded URLs suggest it's part of a phishing or malware distribution campaign, likely delivered via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bccbd51cf7---mewebujulewoler.pdf
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c262f97ad5c---zerajuvepokuto.pdf
    • http://lorichphoto.com/pictures/file/nubutaninomemeraj.pdf
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098337aa7264---nusubomuwixemem.pdf
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/p9bcg9dsld1vik5m7eptcpd513/vibitagiziwidewumapaxaf.pdf
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/eeb6ca0c61946f8a430b5e2d8e8a439f/lamavufebilifimeko.pdf
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/50d162314da5da48b46a6fb9dfc28d61/jejetaboxedab.pdf
    • http://hiro-seiko.com/upload/files/59182755725.pdf
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/f7e3b619d3c986ff5f6b7898b61ea3b6/gakit.pdf
    • http://buergerforum-tirol.at/file/tijavepemurotevopixukirux.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dbb5e119bb---vedizekizali.pdf
    • http://wallsfamilyreunion.com/clients/876683/File/94512266807.pdf
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1da05d6457---nakupinikorolagim.pdf
    • http://nano-vip.com/ckfinder/userfiles/files/67955675539.pdf
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/b65eed744f2a58afa7feff952d8262b4/33168409409.pdf
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/92f60b1123ff9fc29bd7493a1729be0c/xinajatojadolosakiduj.pdf
    • http://brenno-tojestto.pl/userfiles/file/pijivinarobagori.pdf
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160904511e56c2---bitimi.pdf
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/bcd31b3f3d3b3239d3541dd436d96a89/40012692182.pdf
    • http://alibabashipping.com/userfiles/file/xelumasuvaletedotuja.pdf
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b32a34134d4---jilibabapofasasikuxulu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=tancet+books+for+mechanical+engineering+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_off0000edb0.bin
f739c913c9c4b4004980d34b1c3516c7f6f9ee485c353896c89fa6fdc5cc32d0
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB0 17604 bytes
font_01_sfnt_off00011bd4.bin
a4ee079f211cf96888985e81b47a81544a5e0688835ef8942cc886d38985ed4e
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD4 11260 bytes
font_02_sfnt_off000135ae.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x135AE 16792 bytes