Malicious PDF — malware analysis report

Static analysis result for SHA-256 7513e7b4979690ff…

MALICIOUS

PDF

100.8 KB Created: 2021-08-13 19:58:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 935a0fd9aeaf3781cdc4fd5555600207 SHA-1: 6c186b0e13faf6ff707b03b57e6477ed6a5336da SHA-256: 7513e7b4979690ff06f6d55e3af2acb999425bf0a162a5cf7a488239e4a98f21
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs that form a link farm, pointing to compromised WordPress sites and other domains, likely intended to redirect users to malicious content. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its true purpose, which is common in phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://smidgel.ru/uplcv?utm_term=aws+certified+solutions+architect+official+study+guide+saa-c02 PDF link annotation
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16079e33a66103---21984560827.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0be077269---10894587055.pdfIn PDF document text
    • http://maility.pl/_ADRESuserfiles/file/vipiruvivapuku.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/etuu7uoe6afh25tsv58rros3t8/faxaviri.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e87b7971be---95336965302.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/jimivasudeno.pdfIn PDF document text
    • https://sanipacific.com/attachment/file/9498951555.pdfIn PDF document text
    • https://xn--z4qq44i.xn--kpry57d/upload/actfiles/49217081893.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc34f3890b---jaxiwof.pdfIn PDF document text
    • http://kurier48.pl/files/userfiles/file/79181587684.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/1f83d0e0e7cd6c4d61b22678c943e368/juvebuzek.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/jeladeporuvo.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/5360a313a0766e29f7ed40a599fcb967/11818926646.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b516ba09459---figenox.pdfIn PDF document text
    • https://bda.ch/ckfinder/userfiles/files/35122912838.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608897c3c6517---xineku.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/ec2f9526da54e73fe337d85c9bed8016/danazulizexedi.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/dd10255e8b2747b94314cdfda255ebed/62726364327.pdfIn PDF document text
    • https://aedwea.com/upload/foto/61282523927.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9c200f96f779450c891a919ca2a9f833/ribumekerobizovakaxava.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/22831010479.pdfIn PDF document text
    • http://zimaletto.com/uploads/file/satomejobunuji.pdfIn PDF document text
    • https://francoisdaulte.com/ckfinder/userfiles/files/5324338644.pdfIn PDF document text
    • https://aws.amazon.com/certification/TheIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011c36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C36 11312 bytes
SHA-256: 7d6d97391a907562135066944d3fe19aa18505cb1e28664a4724ad87abac1c8d
font_01_sfnt_off000136bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136BC 20820 bytes
SHA-256: c2ed5b0e663d821cfa0591523c046ce2675a09325ef3d8995488927417a10582
font_02_sfnt_off00016c60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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