Malicious PDF — malware analysis report

Static analysis result for SHA-256 c26e482a7e2ca66e…

MALICIOUS

PDF

90.9 KB Created: 2021-09-04 03:24:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 13c5867d96a9addfd7bd999418885bbd SHA-1: 43b3a87e779235eaebd9a1a8aacf77bdceacfecb SHA-256: c26e482a7e2ca66e4bec0fb4b41a777212614fbf4c27e7c24ad37ce4a09b4664
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links and the overall detection indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://atut-biuro.com/uploaded/file/77010064449.pdf In PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/wiroliwajutot.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b71255a8fc8---16526402801.pdfIn PDF document text
    • https://leresto-niort.fr/images/userfiles/files/difiwigusu.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/98441510393.pdfIn PDF document text
    • http://alburigiott.it/userfiles/files/62577167978.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f201959db0---fesudapawupuragi.pdfIn PDF document text
    • https://weboonline.com/ckfinder/userfiles/files/pipazero.pdfIn PDF document text
    • https://trompis-tondschungel.de/userfiles/file/78001178897.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608235f52acf3---wadutoges.pdfIn PDF document text
    • https://sca-eagleegg5k.com/ckfinder/triplebuserfiles/file/jejuvuxakatebiti.pdfIn PDF document text
    • https://andrejc.si/files/file/92584969123.pdfIn PDF document text
    • https://hanyauntuktesting.com/contents//files/matosutafe.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/41886358194.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160fd26fb882c3---kavow.pdfIn PDF document text
    • http://demkapi.com/resimler/files/44110025556.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ad556368f96---jusogiwujunop.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c95b7cec1cd---subokipasozokugo.pdfIn PDF document text
    • http://tcihk.com/userfiles/logivulirotikazalib.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/devakot.pdfIn PDF document text
    • http://syarmarka.ru/userfiles/files/55445463193.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/161163c614de51---ratisakopomemoxajepepe.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/41457588437.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/dab55b3aa7f73db6ee823e3959cc7de8/duxugunomova.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=trespass+to+land+cases+pdfPDF 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_off0000ffcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFCB 17592 bytes
SHA-256: f069ed128f1cd498e39141499b0b1522eba5e585f314f8f562ba4c0ac8f0730e
font_01_sfnt_off00012da8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000145bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145BF 10484 bytes
SHA-256: 013388e833b44da697783a725ea0963b10af637fa70320ef4fc2f33e70dab78f

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