Malicious PDF — malware analysis report

Static analysis result for SHA-256 a39137e7b7092ef0…

MALICIOUS

PDF

79.6 KB Created: 2021-09-01 00:16:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4cc055f2fa2963937f19beba728facb2 SHA-1: 4c9e2aeae35c40e09e3fa2b19b3e23cf877270ef SHA-256: a39137e7b7092ef04f722990bcb4494299130846e611cc1c763b1468144e28b2
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised or disposable domains, suggesting a link farm designed to redirect users. The ML classifier strongly indicated maliciousness. While no scripts were explicitly extracted, the structure and numerous embedded URLs point towards a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 5

  • 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://garglob.ru/uplcv?utm_term=how+to+make+pdf+stamps+permanent PDF link annotation
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/fiqvf9fpa5bl41903oh2umseae/rizetu.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/07/16/file/20210716_022927_116.pdfIn PDF document text
    • http://yarpb.ru/pic/userfile/1988954212.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/76311332497.pdfIn PDF document text
    • http://cu-hinothai.com/ckfinder/userfiles/files/15868175432.pdfIn PDF document text
    • https://safehouseservices.in/fckfiles/file/womozoxesar.pdfIn PDF document text
    • http://tlumacz-lipno.pl/pdrzewiecki/files/60155511820.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c722da89a09---68630457129.pdfIn PDF document text
    • http://kapli74.ru/upload_picture/wakabo.pdfIn PDF document text
    • http://nitm.ac.in/nitmeghalaya/ckfinder/userfiles/files/sezavozawinoramew.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160abf46c26d6d---lanilewafibizikelovumi.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/88009806115.pdfIn PDF document text
    • http://www.ezmoving.com/file/83191019321.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff6b16e4b7---55493551437.pdfIn PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607259896f778---46557748508.pdfIn PDF document text
    • http://kopdesign.nl/userfiles/file/ribakonepekuruja.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c237493771a---rorogosubiluburise.pdfIn PDF document text
    • http://perlawarmii.pl/userfiles/file/zamusijibonef.pdfIn PDF document text
    • http://aadcnfgl.netsociality.com/upload/files/sezakude.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/18171382158.pdfIn PDF document text
    • http://sicilyontable.it/userfiles/files/vinawofifub.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8bcebbb2df---96234327747.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/cad6a6297deacf001494964859038f30/17655241289.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/57976620459.pdfIn PDF document text
    • http://yurisolomko.com/userfiles/file/gopotuzudimajidim.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_off0000d33a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD33A 10692 bytes
SHA-256: 7efbc5534c1707ef2b527a501228281329d516eb6804f8da5f5bc7d69af680f1
font_01_sfnt_off0000ebc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000103d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D6 16836 bytes
SHA-256: 92bef1324ae7c294691e1043859fe27147dbe3f73ee94378ad1a82ca2f51691b

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