Malicious PDF — malware analysis report

Static analysis result for SHA-256 182c6c0f1c29294d…

MALICIOUS

PDF

77.3 KB Created: 2021-06-27 23:14:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1f425b5ed5779c964f59f006a7045d39 SHA-1: 4b0b1c22906a4dfe513afcffe6296b9e18964030 SHA-256: 182c6c0f1c29294d6d91966bbd56a55b83f5a2188f44ac951bdc3f18b70d2c3d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with common phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d085628c1fe---kofosifebuwilonesel.pdf
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c560c1680f27245c01326e6e59f73731/nuwojoxikomobuferosuref.pdf
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160818eeaed7fa---73650777166.pdf
    • https://vydavatelstvoklett.sk/userfiles/file/tomonuxafupeweliwi.pdf
    • http://archi1919.com/smlclub-files/file/moxinuxoselapesisa.pdf
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16099004e016c0---32742775549.pdf
    • https://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/mkl2m460lbf6vrgcnjqq6qssj4/raparazofuwemotuj.pdf
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b1bddb4ec96---wujirabovus.pdf
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/c1b298241fcf7b7ef9ba1e454a47926b/32076481697.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8f903156d.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ed2d0308e---54779124559.pdf
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/8ig1ssvfv6kh0e2q672kgd93ne/denigat.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/emfbl2775keo60g2fih1vpiac5/28749734446.pdf
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/obtio9n43a6857j1kc1ktmugiq/16316258575.pdf
    • https://eatorhours.org/e-bussiness/fckimages/file/43054299500.pdf
    • http://kemenyseprosiklos.hu/upload/file/90976765517.pdf
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/zofodun.pdf
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/5ubur2sis451kd6kjv65cjh516/3356006831.pdf
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/6i1ppmg39gk7nkqkvsr64r0vrt/daribujiruzi.pdf
    • http://myucmas.com/userfiles/file/lixevawukomeluluxunidaru.pdf
    • http://krevue.cz/UserFiles/File/vuritezetenibawogukuxala.pdf
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/6gn7ujo55j76icgaqtru72urbf/60119695425.pdf
    • http://thomas-reunion.com/clients/8/86/86f5f051d314e00f57792b8428d7085d/File/61565806239.pdf
    • http://campingwithconvenience.com/files/files/mutizubazaxawos.pdf
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a2de84d03de---fesudarajejunofigewuk.pdf
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/1t28qeifl0v172o1oc7v1rmf9j/5802051046.pdf
    • http://xn--80age2amlc.xn--80adxhks/pics/images/file/31375855197.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=sweet+stack+shack
    • 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_off0000cc8d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC8D 16792 bytes
font_01_sfnt_off0000e4a4.bin
55f41af113c525b00c02358cb75b289362d63c81ad03869830dfdffeceffb7ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A4 10116 bytes
font_02_sfnt_off0000fb78.bin
28995a18389295063af0fcde18c2f6e55319c390bafb09cdb3acc7bd571d5aff		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB78 17120 bytes

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