Malicious PDF — malware analysis report

Static analysis result for SHA-256 b57984af9ddd37bf…

MALICIOUS

PDF

98.6 KB Created: 2021-08-01 07:48:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2f985ef0e60d54cb83d0e3657babea0d SHA-1: 836c7b6afb368edc65703884b9132c5baf2adb22 SHA-256: b57984af9ddd37bf446aeb7dd18c6c9576831ee9eac77ab1bebfde043c94ed3c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, along with the numerous unknown URLs, strongly suggests the document is designed to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://micro-churches.net/uploads/file/kenilozagizipuku.pdf In PDF document text
    • https://chiataiec.com/userfiles/Proj_Name//files/48514429470.pdfIn PDF document text
    • http://archissimo.eu/userfiles/files/mofanimorebimu.pdfIn PDF document text
    • https://fallsplat.se/file/dajulebezun.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/78382231666.pdfIn PDF document text
    • https://atvatextile.com/upload/ckfinder/files/33517746449.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/063aa524971e49ae8bb6e9780e3ecd40/31010512215.pdfIn PDF document text
    • http://ms-krmelin.cz/app/webroot/files/files/95094927957.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/fasiz.pdfIn PDF document text
    • https://fourseasons.events/wp-content/plugins/super-forms/uploads/php/files/900f74e03d79948dff1348700cb066c0/togolowukoxisiluga.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/f65b9409c5145a104fb898e29bcc3251/16366685809.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/kujupuvikoledatutizoja.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/e3sngd3dgtvjq3p3knkrhadb69/57263281195.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d56d13ba671---fupazitaku.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6ca7e018e---75081595739.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/v3ilageamivpa91gr3nntsshhb/97395477283.pdfIn PDF document text
    • http://happysmilecard.com/uploads/files/xajimuravixevofagitul.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16080f5188f61b---fovanulo.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2fd1cf5fabd412c4088e6dd6870c935b/64056904032.pdfIn PDF document text
    • http://doubletroubels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607613ae55196---kixelulexusojewovizekaba.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/49bbb115a961a770ec0146ff249a77fb/39691048445.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/a638b689e2a646709397d5d6a053b441/2095819992.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/67239818060.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=conversi%C3%B3n+de+kg+a+librasPDF link annotation
    • 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_off00011c56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C56 18052 bytes
SHA-256: 94702a64fdd5a33481466052584ab405c5007f968dfa5d1a29091f7e2f9882a5
font_01_sfnt_off0001493b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1493B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16152 10792 bytes
SHA-256: 4f148e7bcca6acf106ed1628749676a7ba6552323c131b2d7c9840418c963f20

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