Malicious PDF — malware analysis report

Static analysis result for SHA-256 4512915e7fd6cfb3…

MALICIOUS

PDF

132.2 KB Created: 2021-09-06 10:14:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 664491d8311314f1959ce93e9c27930c SHA-1: 41bc953df12828b5924630fd87c9f363feb3787c SHA-256: 4512915e7fd6cfb3c407dbba521879c7e9e7a6dcce9966c9f4f92d656ca33bc6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links and the overall detection indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/mfsqre3hsdh7ce22lf08s8sg8g/8379301702.pdf In PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/96qr0brvm09uqjqfkt85pvj9v2/95476573229.pdfIn PDF document text
    • https://mimpishio2bet.net/contents//files/wuwuzabafanewinatubeg.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b49098356b8---sililidefe.pdfIn PDF document text
    • http://fra2ange.it/userfiles/files/bitewojibarisagewi.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/c74f8d69ce05e31ce6b5b0a30ea66970/desinemifusameza.pdfIn PDF document text
    • https://intersensor.ro/v2011/Files/fck_upload/file/92771291845.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/73870731131.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/33183807709.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/92088018278.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/14880519616.pdfIn PDF document text
    • https://actorconseil.com/files/file/tapekebegidusikunoxog.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/fe4ac22dcb3b84e9ce9addb3f2139203/namawojukanifujakosekibod.pdfIn PDF document text
    • http://ksklinika.ru/ckfinder/userfiles/files/bazukipovikoxilelawobad.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/gamuwepafuluzebeda.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/73291651424.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/2420177296.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/vetenareg.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202106181101287766.pdfIn PDF document text
    • http://willbramephotography.com/52832528512.pdfIn PDF document text
    • https://szemvidito.hu/sfwkr/feltoltesek/Images/Image/23100235332.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/62792006005.pdfIn PDF document text
    • http://shinyoungvalve.com/userData/board/file/93967168721.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/d22ed1254d3c0dfc699bc08a310d8b91/42884144034.pdfIn PDF document text
    • https://mayurherbal.com/userfiles/file/28690530442.pdfIn PDF document text
    • https://client-sms.com/ckfinder/userfiles/files/79929903922.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/ul49mkqeupj9gicg0o3q66lh15/75968121690.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=hr+assistant+job+description+pdfPDF 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_off0001a009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A009 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001b820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B820 10828 bytes
SHA-256: 99875988d8560d597b27e34c9ea889d4bcd5e2a38d4bc03a19e78b3c5deec20d
font_02_sfnt_off0001d0ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D0ED 18960 bytes
SHA-256: 17ad20c397f61f055235317b272673e0a488388117ca9fddd4d981b3cee2caff

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