Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff92f34508bacd4f…

MALICIOUS

PDF

78.8 KB Created: 2021-09-05 18:57:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6b6f9438a8d1f26a961ed38b9eeb2374 SHA-1: 5cb118fe1fc15e4573f062af2fc61741cf437aff SHA-256: ff92f34508bacd4f01341c26f7141a59114c31dc4818140f4f8d37623c21531a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to compromised CMS upload storage and disposable hosting, likely intended to redirect the user to a malicious site or download further payloads. No scripts were extracted, and the document body was unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://wxjsyd.com/userfiles/files/69292106986.pdf In PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0575d1095---dexusovigopi.pdfIn PDF document text
    • http://marathon-gexin.com/Uploadfiles/files/29568962363.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/c7aee2f875769e1b90dfbb041f1a79ac/49179999162.pdfIn PDF document text
    • http://maksimetall.ru/files/21841225093.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/3685e68adbbfbda6893705a1532ee1bb/75592597395.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/afee6481eaa81d930f028edd4a9c4cde/zusefavovedufoxamof.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/88871364210.pdfIn PDF document text
    • https://bazab.ru/ckfinder/userfiles/files/lapira.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cec33c0f7fa---17137188202.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/44636381110.pdfIn PDF document text
    • https://kaskad-74.ru/images/uploads/parowipimitojaref.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/12132401816.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/401c4b15715ec7d26348b0af0d57b8fc/57338896446.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/d7f07c7112a514f6b212c1927b8e3a0e/51868044832.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/rutonifosigi.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/fizutodowaralosifiwur.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16102b1ccc3826---xuxaludome.pdfIn PDF document text
    • http://patokapugsnkisses.com/clients/61143/File/risuzunurewuserajososipup.pdfIn PDF document text
    • http://jogforbigt.com/clients/6/61/61f7a61d17da296148a50ccd59c4a139/File/rokakuga.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607186379e744---siwunawinasifebisipusobap.pdfIn PDF document text
    • http://shophouse.info/images/files/3443401050.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/277161644c465d497cf90d410d5c446b/lusotezulumigosaranogi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=grounded+theory+adalah+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_off0000d1a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BC 10588 bytes
SHA-256: 2c7f1b6fa1048a8ecaacd337528aef92f3b1fa91372f3c662e2212dc9f726ab8
font_02_sfnt_off000101df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101DF 17064 bytes
SHA-256: 581920313a5ce348d9547f1743f49232280b538cfb4f7386a66ce895ff89f759

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