Malicious PDF — malware analysis report

Static analysis result for SHA-256 193007a2d0060783…

MALICIOUS

PDF

86.5 KB Created: 2021-09-02 08:18:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5b3380a8582dccbef2ccae517ab0df0c SHA-1: cb43f0c959c2b97ebe77c84f4b28ba2cabb05f6d SHA-256: 193007a2d0060783bcf6d76df0cce9270b75adcbcaf3d204be58a19ffef18823
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to potentially compromised WordPress upload storage and other disposable hosting sites, indicating a link farm for SEO manipulation or hosting malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malicious content delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://scan3dsaigon.com/upload/files/58761104296.pdf In PDF document text
    • https://smartcirclegroup.com/userfiles/file/29902422720.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160885eb43e2cb---riwimasuxemapose.pdfIn PDF document text
    • https://drsaman.com/files/8216466526.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1382da04d0---sinabudojazajuvitu.pdfIn PDF document text
    • http://girl0229960192.com/upload/users/files/28426383017.pdfIn PDF document text
    • http://cecev.com/stockages/files/pobisok.pdfIn PDF document text
    • http://csc010.com/userfiles/file/20210714101157_oc4aie.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d22f28a4b7---vogoborefezosivopuxexamut.pdfIn PDF document text
    • http://www.atccs3.it/atccs3/fckeditor/editor/ckfinder/userfiles/files/tanivebikegomer.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3736062537---rokixisuxereg.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609def87a887b---lanotibesifiziv.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/vobafafazakilokigoledum.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/11078385300.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/nuwujawowamubujujutegafem.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/tateb.pdfIn PDF document text
    • https://www.bussmann-tiefbau.de/ckfinder/userfiles/files/1305774148.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/1173161705.pdfIn PDF document text
    • https://tekartltd.com/upload/files/duxaronumemozidixedef.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/ht41ip919tt2vfbb9gob9lmgc4/86755863268.pdfIn PDF document text
    • https://ijmscr.com/ckfinder/userfiles/files/werazumigabatawa.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608210a412d6f---613809608.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/1c861a7d73b1d330d4845f6f58ffb5ee/dakoginonopitimufus.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7206732345---96612739846.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=geometry+seeing+doing+understanding+answersPDF 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_off0000eb21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB21 10884 bytes
SHA-256: 73f2c8f8f03304e9f1bd373af98f376e77eef19d309415914090eec854f6d248
font_01_sfnt_off00010438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10438 18132 bytes
SHA-256: 8348e12bd98e27af92b6db5465779ff22514727171f828f723d1ee63a625dd4b
font_02_sfnt_off000133ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1