Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8b84f729af7264d…

MALICIOUS

PDF

83.5 KB Created: 2021-09-16 15:59:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2cc071ab2a9ad9ab357b4d399139b99f SHA-1: 314e1108b8f5aa85ac223e5c01c7a06995716c91 SHA-256: d8b84f729af7264d2d6a31cff864727bd9ee93a57abbc735ff2c773bc9ef36de
196 Risk Score

Malware Insights

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

The PDF document contains multiple links to compromised websites and is flagged by ML classifiers and ClamAV as a phishing and malicious PDF. The embedded links are designed to lead users to a credential phishing site, impersonating the brand 'Apple'. Although no scripts were explicitly extracted, the nature of the links and the phishing lure strongly suggest an intent to steal user credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=label+the+parts+of+the+human+digestive+system.
  • 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://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/9c8f4fab7bc2ff352844236eafe13489/felosa.pdf In PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/notidezakenolefubisesum.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e986be20c0---fadilexezoves.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/66786776865.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/rowonegotuzilubajus.pdfIn PDF document text
    • https://f2h63c2.ip4secure.net/upload/files/78563493765.pdfIn PDF document text
    • https://osiindia.org/ckfinder/userfiles/files/gutirujusokamiken.pdfIn PDF document text
    • https://lazeo.nl/userfiles/file/43172921438.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613eeb5ac787e---dakiz.pdfIn PDF document text
    • http://onmamtour.com/FileData/ckfinder/files/20210914_7EB8C2A945A79D29.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/keveb.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/da2cc18f56d4f91576d00ba6fa39c500/bigaxalulutiva.pdfIn PDF document text
    • https://undergroundtakeout.com/userfiles/file/gegox.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/vufofamaxali.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/100b6fdc4307fe879468e33b2c8c53f4/60038849387.pdfIn PDF document text
    • https://astdubai.co/userfiles/files/28468839476.pdfIn PDF document text
    • http://rewitex.pl/userfiles/file/zepotewakilarusira.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/zakeke.pdfIn PDF document text
    • http://exima.kr/userData/board/file/jajodasased.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135c966cb8c3---xakobunosejatojivabaki.pdfIn PDF document text
    • https://eetravel.net/file/buriwuk.pdfIn PDF document text
    • http://art-ball.net/files/file/judusopololobokepomuxex.pdfIn PDF document text
    • http://architettoangeli.it/userfiles/files/40644365750.pdfIn PDF document text
    • http://oaklandscreche.ie/userfiles/files/refatisudikejozed.pdfIn PDF document text
    • http://utpcomp.ru/uploads/files/1572572202.pdfIn PDF document text
    • http://allier.proximeo.com/ckfinder/userfiles/files/wesafavojis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=label+the+parts+of+the+human+digestive+systemPDF 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_off0000e01e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE01E 11324 bytes
SHA-256: 5310c161cc25ae504238aaee930fc09b1d71e91326d3f86ddd32684333da147d
font_01_sfnt_off0000fa23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA23 17856 bytes
SHA-256: 0c02fe432570410623f7b17c47c899e0cb46bf19dd566051f04fa1f0629c6ab6
font_02_sfnt_off00012806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12806 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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