Malicious PDF — malware analysis report

Static analysis result for SHA-256 a24113dcaa385535…

MALICIOUS

PDF

83.9 KB Created: 2021-08-16 12:16:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e3a5f7b7675d907ca15208747f5c7e4f SHA-1: 91c148a6632484d5e8f5fda5452bb8b54c544faa SHA-256: a24113dcaa385535dd4180e300928f41795f00dc29ea70c3e860da31bce9b142
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm used for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://ntwbearing.com/UserFiles/File/55339807776.pdf In PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/161099ebc9b3f3---felumakurigaguwiziv.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/ssv76tqqf4qkh8ooavir62mca0/53495462075.pdfIn PDF document text
    • https://fajanav.com/aym_image/files/zekesusaxegoziwusis.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c909ed269c---kemuxipuxanipijiku.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/f6ed33368361c7c57e2925e418ad5e7e/53979618134.pdfIn PDF document text
    • http://filtrydokoparek.pl/img/all/52787516350.pdfIn PDF document text
    • http://bronia.org/userfiles/file/31436077583.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608d900ef37b6---54979372932.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/91396930436.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/20216261528282553.pdfIn PDF document text
    • https://www.cdsale.org.au/application/third_party/ckfinder/userfiles/files/93975706709.pdfIn PDF document text
    • http://allivecoat.com/userData/board/file/pemaxofovokofajonipolori.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/jeboradexenuzodisogofosem.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1610ef7ee08482---gododakok.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/4110198137.pdfIn PDF document text
    • http://bjjiffy.com/upload/pexojiwalijelimunalu.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f39bf8c1e2---pagagizunal.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/1182837851.pdfIn PDF document text
    • http://srhs1980.com/clients/877094/File/pezibepezazituw.pdfIn PDF document text
    • https://cupanghitam.com/contents//files/42317293759.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=how+do+i+fix+the+flashing+red+light+on+my+dyson+v7PDF link annotation
    • 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_off0000e19b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE19B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AD 17380 bytes
SHA-256: 4eaf598a362cf4943568fdc540ef7b16b654b3be6a329978e8b311b48cf56f0f
font_02_sfnt_off000127a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127A4 11212 bytes
SHA-256: 714bf64207353bbf20e4156e3f3909e2da3adc6b4462110de903a2ca7535b642

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