Malicious PDF — malware analysis report

Static analysis result for SHA-256 72381790912fcdfe…

MALICIOUS

PDF

73.5 KB Created: 2021-08-29 00:28:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 477367ad01202e383a39c214460984d3 SHA-1: 45bd8e55797ac10cf1510b768a886e6db37d75d4 SHA-256: 72381790912fcdfe0bf65f8de60e91b0a8e2913c6b382adcd8afc65d35af6fd8
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan distribution attempt. The heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites, likely to host further malicious content or phishing pages. The presence of embedded URLs and the nature of the link farm suggest an attempt to exploit users through deceptive links, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://huntic.ru/uplcv?utm_term=dich+to+english PDF link annotation
    • http://dientrotiendathc.com/media/ftp/file/71373321329.pdfIn PDF document text
    • http://maybomchuachay24h.com/Images_upload/files/vagudu.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/4457c0856aee39bbdb039cc69f5619bb/43659125891.pdfIn PDF document text
    • https://narimasu-chintai.net/jcfiles/file/21797403167.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1f588af90---wojubutufaxokal.pdfIn PDF document text
    • https://turdv.ru/SITE/files/editor/file/86970037320.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/79159508459.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6d8d97447---roded.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/91898329982.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c91752c5e07---67780773971.pdfIn PDF document text
    • https://robertbah.si/files/file/wixituwubag.pdfIn PDF document text
    • http://cunningham-reunion.com/clients/7/73/7399477c88ef979e1ad3ac38e42cffcc/File/63878738075.pdfIn PDF document text
    • http://sadrainsurance.com/UploadedFiles/New/file/wudonojilupexo.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/vujuxe.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///xasoziburulidafodo.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1610e7cbc9def1---buviwugav.pdfIn PDF document text
    • http://hbleg.com/admin/userfiles/files/26292666940.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086dbdb5b1e5---duwili.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/ckfinder/userfiles/files/dojabixelifodijekerojolem.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1612aa3cd17f8b---wozezerovitegokuno.pdfIn PDF document text
    • http://csc0516.com/userfiles/file/20210608155334_ls6uts.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/19f661216eebfd7b4a3f5a844e9a6f5c/vikavubitatunimuzoxagegov.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/49779977573.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_off0000bcbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D3 10248 bytes
SHA-256: f17c95609a6673a94549aab57bc66f2c8da6906b0207bb20e39d631e5ba4bae5
font_02_sfnt_off0000ebc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC4 17204 bytes
SHA-256: 1498d8437494bd415ddb0890d0b5b1c2d267117f8f36185353b4d9f30c1db702

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