Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5d7d9a413de46b8…

MALICIOUS

PDF

84.5 KB Created: 2021-09-01 23:01:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3349c9f12c585921f8d6262e62400786 SHA-1: dc7d2ec93790186f7b38a2ae8f03d778dc96af05 SHA-256: b5d7d9a413de46b8febdca3b525db0c2b24b77605d3ffce1b4e884ba7d84a483
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV both flagged this file as malicious, specifically identifying it as a phishing or trojan-related PDF. The primary function appears to be acting as a link farm to distribute malicious or compromised content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://newo.ru/files/files/8923439143.pdf In PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/xupudokisis.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9d7fdce4b3---25579081613.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160943fecc3e5a---57789051667.pdfIn PDF document text
    • http://soupworld.de/upload/file/42183146399.pdfIn PDF document text
    • http://mega-treid.com/userfiles/files/80455250528.pdfIn PDF document text
    • http://tokyosushilohaus.com/uploads/files/gifen.pdfIn PDF document text
    • http://dwhs79.com/clients/15834/File/56960112984.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/sozemufesisubatijen.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16081308cdc510---70541886996.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/51dbe3c680cd326401cb002ac696d55e/motovibuxuzijurinereza.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/t3fb7pqq1buqbh5tbscnmo5io2/sofed.pdfIn PDF document text
    • http://www.motocams.cz/ckfinder/userfiles/files/soselo.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/dbd9b830af0256a9b97a312dc19af0cb/7612360739.pdfIn PDF document text
    • http://dezmaster.com/userfiles/file/554609999.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a334d3a74f---58844507091.pdfIn PDF document text
    • https://efnnma.org/files/file/desewupijafiv.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16112bd4ee5f45---jamipuzepamipagos.pdfIn PDF document text
    • https://quanghuydulich.vn/img_duhoc/files/kolewitajibodifix.pdfIn PDF document text
    • http://dissanna.com/temp/fckeditor/file/76314639573.pdfIn PDF document text
    • http://premiercontractinginc.com/files/file/77584846862.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4e737e12d---22323503743.pdfIn PDF document text
    • https://computerzone.pk/file/zufevasosoloxu.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b42fc00b672---zupiwivodukejabupux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=past+present+continuous+exercisesPDF 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_off0000e553.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE553 17280 bytes
SHA-256: e45ea6caee122dc41f710a8fe3219c5ffebccee99bdcb1d0416fac6d6044e260
font_01_sfnt_off0001120a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1120A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A21 10524 bytes
SHA-256: 7883d5618f20d8f627180b0185a6bd98cf59b91ff1027b07b910627a652841d9

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