Malicious PDF — malware analysis report

Static analysis result for SHA-256 792c1c02a9eef1ae…

MALICIOUS

PDF

79.0 KB Created: 2021-09-14 10:02:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e70af5f715ea2939ef7e12f14fd5fb90 SHA-1: dee6fff68fff3138bdd04e340c7b07a3118d295b SHA-256: 792c1c02a9eef1aec7ce82594399bd3a803fe7ba49df5efc51c8827d6e48a820
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm. The presence of external URI heuristics and link farm detection rules strongly indicates the document's purpose is to redirect users to potentially harmful external resources, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://pixomot.ru/uplcv?utm_term=can+you+lay+a+refrigerator+down+when+moving+it PDF link annotation
    • https://onlinendttraining.com/files/13537687118.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613daade9d75f---jabiwekegajututufutoti.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1613554dc850ea---fafujewedewiwupo.pdfIn PDF document text
    • http://champagne-marc-chauvet.com/images/files/72313520689.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/pekuvemuxipirowom.pdfIn PDF document text
    • http://getampedmag.com/ckfinder/userfiles/files/52054672541.pdfIn PDF document text
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/tofinijukumibutaraso.pdfIn PDF document text
    • http://atomiccm.com/userfiles/files/78125135807.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/57739854493.pdfIn PDF document text
    • http://paglialonga.it/userfiles/files/53333233908.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1614010dacf3c1---malorojolewijurufusimikuj.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/65188856331.pdfIn PDF document text
    • http://voijin.com/userfiles/files/wadiwuvetedimilowur.pdfIn PDF document text
    • https://ph789.com/pinhsuan/files/file/35215361711.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612f98f4f0a7a---latisakidaredawirikodoki.pdfIn PDF document text
    • https://harmony.im/userfiles/file/65179457476.pdfIn PDF document text
    • http://scarpatti.com/files/41162437736.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/wewubelosaxakavavaleni.pdfIn PDF document text
    • http://safedoorsystems.com/cmsimages/file/16274549107.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210912194225.pdfIn PDF document text
    • http://nuuts.mn/uploads/assets/37022003565.pdfIn PDF document text
    • https://www.jancsoalapitvany.hu/ckfinder/userfiles/files/65613341993.pdfIn PDF document text
    • https://sanipro.ma/app/webroot/uploaderfiles/navijuzebuk.pdfIn PDF document text
    • https://polenhosting.com/calisma2/files/uploads/nefofiwasomidovasoneveni.pdfIn PDF document text
    • http://aotwresort.net/ckfinder/userfiles/files/12075267876.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_off0000cfb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFB5 17384 bytes
SHA-256: fb71260578a4ed5213b04791adebe77b6fdb0e7b78ad48a7fb4c6960aaeb9598
font_01_sfnt_off0000fc44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC44 11032 bytes
SHA-256: ef53d39c2b183039cd0498e87d875cf90313e581aae16fe08914605a03dadb6d
font_02_sfnt_off00011599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11599 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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