Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2e9f4302dc51756…

MALICIOUS

PDF

81.1 KB Created: 2021-08-19 19:06:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: df1a88ae43bb2016a68cd5c2bc00927e SHA-1: e7f68959299c554e1dbff89bb2c5bdaadfe1447a SHA-256: a2e9f4302dc517563ab8cad6232f87654436cd2dbeecf48a341aff55d9740fd9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of URLs, many hosted on compromised WordPress sites, suggesting it functions as a link farm to distribute phishing content or download further malware. The presence of multiple external URIs and link farms indicates a strong intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://oniceh.ru/uplcv?utm_term=amsco+apush+2020+answer+key+quizlet PDF link annotation
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160aa40320b87f---14243803989.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b97421a388---lamabifufonerimo.pdfIn PDF document text
    • http://miroslaws.com/ckfinder/userfiles/files/kivonugifozanewamavelovar.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/zojewaje.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/285509c45b99b6fba087615c97707d93/vowadozekodiwegitonusasif.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/gvvvbbp1isrmnojmhs35mp9d16/dupegigarafidajovorugo.pdfIn PDF document text
    • http://3qbuy.com/CKEdit/upload/files/kudizizokifufeg.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/2479c3e612a0dd4b6c1136cbe2353875/duzazu.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/dc2gaktnfcm0sqem4v61eqliq3/nexabujenija.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e54d143ff---50015632224.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/kezazojuliwafuzuwiralesu.pdfIn PDF document text
    • https://noddy.nu/images/file/55002965466.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160c1c784cc5c7---sageb.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a92207c770---gixusogezajulenagixokopen.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/5ickgp78tv9lsn9f50s4r33j36/xupikonu.pdfIn PDF document text
    • http://ecohouse-lab.com/userfiles/file/jelogurepejemavipi.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/daa452b9910b8561cc13f94af7672a55/76472303213.pdfIn PDF document text
    • http://daedukgs.com/admin/fckeditor/data/file/20210805135656.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/1uvc94jo6uvqlu5dfo5lptof13/93919189523.pdfIn PDF document text
    • http://avgdesign.com/userfiles/file/17975718960.pdfIn PDF document text
    • http://storemisr.com/uploads/files/74221494351.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/6350vtsj047e4tvlec0rdp8aan/tulozonunakiwusafiwu.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077846b820e6---zurapawenewexokepomutakux.pdfIn 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_off0000d5b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B3 17332 bytes
SHA-256: d942f92cc8437111fa2e3851e937beb08cf43a4845bf46f66186a265cf0424f3
font_01_sfnt_off00010348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10348 11460 bytes
SHA-256: 3485a207bc6c6f65c63ec94bd15f8645a36457c5ee400e4aa1b8d663f3f81eac
font_02_sfnt_off00011e5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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