Malicious PDF — malware analysis report

Static analysis result for SHA-256 d913a31a5052460c…

MALICIOUS

PDF

83.3 KB Created: 2021-09-18 03:06:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 35b8400ea14159471228b5a5b2cd5e8f SHA-1: c6c65c40189ad78f3e8585b33be1901fe0eb1357 SHA-256: d913a31a5052460c0ca2efe03301e761bce1242f0c087dfb6eff4cc2120386dc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://crysiq.ru/uplcv?utm_term=100+mb+android+emulator PDF link annotation
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/a3q76v34qioi7u2ncha4q584sg/92690498888.pdfIn PDF document text
    • http://siamsankyo.com/Uploads/file/10075047833.pdfIn PDF document text
    • http://sgo-bage.com/public/files/files/farofijakabeduverelefuru.pdfIn PDF document text
    • http://kamakuralosgatos.com/uploads/files/tikanimoxugajikeg.pdfIn PDF document text
    • http://www.hz-kontejnery.cz/ckfinder/userfiles/files/surobegejukojejaxin.pdfIn PDF document text
    • https://fluffy-chins.com/images/file/varexaj.pdfIn PDF document text
    • http://perfekt-dom.pl/designhome/admin/userfiles/file/33268203016.pdfIn PDF document text
    • https://snowcat.pl/admin/ckfinder/userfiles/files/30312384856.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/lfhv80v87bm1n1vbuvgh72vt7k/93631289091.pdfIn PDF document text
    • https://nacituran.com/userfiles/file/tamabokabum.pdfIn PDF document text
    • http://ck-kutnahora.cz/gais/image/file/forubefojikenikerovoso.pdfIn PDF document text
    • https://jphotographyllc.com/userfiles/file/tebaviku.pdfIn PDF document text
    • http://uleshuzatshop.hu/files/file/95211208978.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/10899585185.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/14be9c24cf51de5935f0dee14210b1c9/53453961965.pdfIn PDF document text
    • https://fu-ko-property-agency.com/webroot/editor-uploads/files/94635986771.pdfIn PDF document text
    • http://ingore.cn/upload/files/jexuzatepovaxitujaxegul.pdfIn PDF document text
    • https://aneri12.eu/res/file/saxosupifufodebamewil.pdfIn PDF document text
    • http://fertilityupdates.com/userfiles/files/59757827834.pdfIn PDF document text
    • http://zhuoer.ltd/userfiles/file/zebim.pdfIn PDF document text
    • http://studiogeologicotrilobite.com/userfiles/files/lazetajol.pdfIn PDF document text
    • http://sinosteelcode.com/filespath/files/20210908023353.pdfIn PDF document text
    • https://global-brand.net/userfiles/files/53979600582.pdfIn PDF document text
    • http://blossomtour.net/FileData/ckfinder/files/20210916_BA9AB3013EC4F6B2.pdfIn PDF document text
    • https://iphone-odklep.si/vsebina/42553725706.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_off0000e0f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f910.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF910 10560 bytes
SHA-256: 383774c2474d7beb7f564bfd2d4bca09324415b4b7638ff03fce79b28f02d2e1
font_02_sfnt_off00011101.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11101 17852 bytes
SHA-256: 22c2316f630f32f52d09604ccafe348868df41ccc859f2e6b07b06fddc5321b6

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