Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6dbb1c2d6db9eb2…

MALICIOUS

PDF

80.0 KB Created: 2021-09-23 09:51:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: cf797182da42626e0367da9c805215b7 SHA-1: 8b870ec8cd1f9ab2ab4575f1b2390cd3d4a0d271 SHA-256: b6dbb1c2d6db9eb261c1fbfc884f6e9d5e8208409a6dd9d5e053db7491f5291c
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm pointing to numerous disposable hosting sites and compromised WordPress uploads, suggesting an attempt to distribute malicious content or phish users. The embedded URLs and the nature of the heuristics strongly indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://ketchas.ru/uplcv?utm_term=radhe+online+movies PDF link annotation
    • https://giolog.biz/images/bulk_images/files/95634871316.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/2021910312182045.pdfIn PDF document text
    • https://hfbee.tw/upload/ckfinder_temp/files/20210908153114.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/zititogekebisigolelixax.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/5769df63efc234e92a7f23065ccc7681/nevukikupeg.pdfIn PDF document text
    • http://soles2walk.com/data/file/44816911891.pdfIn PDF document text
    • http://jiji.pgo.tw/pic/uploads/files/60369338518.pdfIn PDF document text
    • https://taumed.kz/upload/2021/09files/210920182901185371jgvft.pdfIn PDF document text
    • https://dellrein.ru/content/file/vuxowagikoso.pdfIn PDF document text
    • https://tezerwatch.com/file/upload/files/09-06-19-18-03-44.pdfIn PDF document text
    • https://emons-verlag.com/testarea/cwsCMSlight/media/files/90037570246.pdfIn PDF document text
    • http://haiqi-machine.com/d/files/jawavazifokowefe.pdfIn PDF document text
    • https://tapuionoticias.com/ckfinder/files/powexitijurirefepakuk.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613da050c3c34---kexufotemataxudareniveme.pdfIn PDF document text
    • http://odontotecnicacoop.it/userfiles/file/70233078743.pdfIn PDF document text
    • http://www.yevres.fr/ckfinder/userfiles/files/37709643144.pdfIn PDF document text
    • http://daehnfeldt.com/userfiles/file/27168438244.pdfIn PDF document text
    • https://myoffice.acqualive.com/uploads/files/fugulavupufurelejapuzato.pdfIn PDF document text
    • http://medi-sen.com/files/files/35218914139.pdfIn PDF document text
    • https://majubesar.info/contents/files/dunudutuw.pdfIn PDF document text
    • http://th-hl.com///upload/files/49255526466.pdfIn PDF document text
    • https://angem.fr/userfiles/file/dosizadugamiwi.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161471437aac49---titorebaxodebugexalesop.pdfIn PDF document text
    • http://espwireless.net/uploads/file/pubowiwibenadufenuten.pdfIn PDF document text
    • http://risorsaterra.it/userfiles/files/68826970553.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_off0000d761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD761 17076 bytes
SHA-256: afeaecf6221a22e56cf57d0fa62cb3f47651cc554cd51b8d6a9bf0a567b7176d
font_01_sfnt_off00010332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10332 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B49 10428 bytes
SHA-256: 8916f6c4c77f201573b439c68107a7644f3841e0436c8c863cb58d9800d18bc8

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