Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd00879bf652b420…

MALICIOUS

PDF

84.0 KB Created: 2021-07-03 12:58:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 9a852c5dbffd4989013afaa8d9cc513a SHA-1: 4d6ffa699b0c006c66f18b95c42ea5494102a9d7 SHA-256: fd00879bf652b42041088f5ff9ea4fff0fe04838a20c3868b2ba439f3ef3fd38
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which appear to be compromised CMS uploads or disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are sufficient to infer a malicious link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://allytemp.ru/uplcv?utm_term=shower+with+girl PDF link annotation
    • http://ok-poland.com/userfiles/file/nomiginivedonawabamosam.pdfIn PDF document text
    • http://nessium.net/userfiles/file/35251119737.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/7n79rrv3chnj46e5hd61a8mbj2/87782802254.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/vudobireworixegegapit.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/vowemubokoxofax.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/69340521593.pdfIn PDF document text
    • http://www.oiseaubleu-promo.fr/userfiles/file/13379217879.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1606d20cb406bf---32477256283.pdfIn PDF document text
    • http://shreyaghoshal.com/konadnew/userfiles/file/wejozir.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160878a936a00d---widezekizusutire.pdfIn PDF document text
    • http://saptpadi.com/files/file/69569490617.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/22195295175.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b40f3156e47---kakepovumafegobub.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160789070f109a---pegagobopanutoparinineti.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/90ca0851a84cef640d1203fce69008ab/jumak.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b838daee8e9---miwaxato.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/9e81cdf7de0b44daf15230800cf8aa28/zulumojalemo.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/xukizib.pdfIn PDF document text
    • http://lesen-und-schenken.de/userfiles/files/34957942055.pdfIn PDF document text
    • http://sparkpro.lv/content/file/jedebivavi.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160808420611cc---32719434171.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1a773ccff9dcba7077152218fc292d7f/gokeluku.pdfIn PDF document text
    • https://kp-bs.ru/upload/files/fives.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_off0000e8c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C0 10116 bytes
SHA-256: 2fd83efd826d089c6384280834ec9a5681e6a13ab00ecb3b61120985f4fe1af9
font_01_sfnt_off0000ff8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001179d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1179D 16864 bytes
SHA-256: 530980240a030f74526405efe1919e64546ff954c1171f7c581a60a5feaa9e6c

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