Malicious PDF — malware analysis report

Static analysis result for SHA-256 73f508e149bcc5fd…

MALICIOUS

PDF

92.6 KB Created: 2021-07-13 20:30:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 1f1b27607e76107dace26ee0f84dc5e0 SHA-1: 95ee6bbf58e2ea4af255a2127322a8bee164fec3 SHA-256: 73f508e149bcc5fdb6a7885d4a1d34be6656aef2bd236590a2cccfc1ecdafb61
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites and disposable hosting, characteristic of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the heuristic firings are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://pawsandtiaras.com/ckfinder/userfiles/files/42440181841.pdf In PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/fj6tvau7eha527b9elnofqo4kd/rodevavatulusajidelo.pdfIn PDF document text
    • https://luminex.pl/upload/file/wokugovepokuvepo.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608577a1d7fab---58548889722.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160739229a5a31---54927632365.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/kg4vjlck4sk5ud4lln2mnlk547/netome.pdfIn PDF document text
    • http://vincentpopetutoring.com/clients/d/dd/dd6b7bcf94cac99d3bed97cf8166637b/File/ripefebaxosovomunex.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/91299400681.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/r3o1gi8gdfoqkksn5999qipsn7/60258257187.pdfIn PDF document text
    • http://bendhorseride.com/userfiles/file/bujamogowijawizomifix.pdfIn PDF document text
    • http://mp-journal.com/media/file/96435057711.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/8vid29ntfqg3mfiqhubcu5s0hb/wonoxofojexumaduxa.pdfIn PDF document text
    • http://buchtel1967.com/clients/26382/File/21927713684.pdfIn PDF document text
    • http://canadanur.com/resimler/files/vonipujupogam.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e05570272fa---84524412296.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083086d41156---nogasurobadekoja.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/6urbdos1tlr8l8u287vj1ea88g/1293808662.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d8f5ea40d91---robiped.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/lusuwunagopatemirov.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/24754712663.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aabede7276f---kukusitofibamitokava.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/g9955263e7n96p6h4pafi1hib3/75915366450.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/03fae6pcqr0g0j34gb4qmpcj2f/sabap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=gmat+verbal+practice+questions+with+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_off00010488.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10488 11216 bytes
SHA-256: 6c7adb97f02ad16fa28633b355b1c069c057327576410ab51845f05344106e7a
font_01_sfnt_off00011e6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E6F 17668 bytes
SHA-256: ad6999ff4f1947a06d016b22ff269ad1792ffed819213e375bc76dd2f9b67637
font_02_sfnt_off00014cf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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