Malicious PDF — malware analysis report

Static analysis result for SHA-256 81b2f34468bf4e15…

MALICIOUS

PDF

68.3 KB Created: 2021-09-15 11:16:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 0dbcb8112cfd30abce867979387e99e7 SHA-1: 0b285689254631ef6a47afccb2e05caebebcf6ff SHA-256: 81b2f34468bf4e15195638ca8dc5a0f31fb06e50fb9c38e823219162aa07c81c
176 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics, including ML classification and ClamAV, indicating malicious intent. The presence of a 'Callback phishing phone lure' heuristic suggests the document is designed to trick users into calling a fraudulent number. The embedded URLs point to various hosting services, likely used to distribute further malicious content or host phishing pages. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://laborke.ru/uplcv?utm_term=internet+calling+apk PDF link annotation
    • http://bio86.fr/userfiles/fichiers/59606074085.pdfIn PDF document text
    • http://abwrva.com/uploads/files/20163908435.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/161410e2b9f71a---10006211578.pdfIn PDF document text
    • https://thietkeweblongan.com/upload/files/48850644686.pdfIn PDF document text
    • https://www.clinicaepilepsia.cl/ckfinder/userfiles/files/85433088146.pdfIn PDF document text
    • http://piemonteforyou.it/userfiles/file/3981867302.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/51811318287.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/161408efa5361f---zoduruzune.pdfIn PDF document text
    • http://vlajkylevne.cz/UserFiles/File/17236296534.pdfIn PDF document text
    • http://hong-tour.com/FileData/ckfinder/files/20210901_6AC06B3C2C693590.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/bazizabi.pdfIn PDF document text
    • https://dhins.com/testingsites/advantage_aviation/assets/media/file/55778498429.pdfIn PDF document text
    • https://peperita.it/writable/public/userfiles/file/geduwugozuvigabaz.pdfIn PDF document text
    • https://borgopitti.it/userfiles/file/kunofusem.pdfIn PDF document text
    • https://watosaphotography.com/app/webroot/userfiles/files/20210907_042242.pdfIn PDF document text
    • http://kcpsystem.com/userData/board/file/29970440018.pdfIn PDF document text
    • https://avukatwebsitesi.trakyasoft.com/upload/files/96251176996.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1631342734.pdfIn PDF document text
    • https://cafesca.info/ckfinder/userfiles/files/sakavaboxukikuginelerafo.pdfIn PDF document text
    • https://ctapigroup3.com/contents/files/fobiwevexejur.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb7c7e0ecf---durab.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/65821977983.pdfIn PDF document text
    • https://gospel-streams.com/asset/ckfinder/userfiles/files/nutivuriwojisuzux.pdfIn PDF document text
    • https://sunrise-photon.com/upfiles/editor/files/10062354219.pdfIn PDF document text
    • http://nattukoottam.com/userfiles/file/lukemovasu.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b0ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0CA 10304 bytes
SHA-256: a71c61190c80730481e31e8949dad3c6aa9a38ba2d3580b31c3c29bb76da12b4
font_01_sfnt_off0000c81b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC81B 14316 bytes
SHA-256: 6540fab67393a834b165350ef2cf7f7c2021acefa93af2b1b383198e8f6019fc
font_02_sfnt_off0000eb93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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