Malicious PDF — malware analysis report

Static analysis result for SHA-256 43c8751e42260d27…

MALICIOUS

PDF

71.1 KB Created: 2021-09-06 06:31:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3bca1aac3f8931bf1486aaafb707b089 SHA-1: baf8cf34fc91352a47f7103c232b26278cc11df5 SHA-256: 43c8751e42260d2751fc293531de0b5d14a445602f7bdf24d6860218d6bd3392
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

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 http://cristalensi.com/public/File/ruvenurov.pdf In PDF document text
    • http://woods-china.cn/ci2/userfiles/files/20210730070039.pdfIn PDF document text
    • http://cdmvt.cz/sites/default/files/7522188965.pdfIn PDF document text
    • http://artstudiodesign.it/userfiles/files/dojanufapojekopujilugulu.pdfIn PDF document text
    • https://aquaprosmart.com/userfiles/files/13602600446.pdfIn PDF document text
    • http://dzwigipoznan.pl/userfiles/file/notiniratimenasudelaxa.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/vosevasozije.pdfIn PDF document text
    • http://lexen.ca/userfiles/files/gajog.pdfIn PDF document text
    • http://dekogard.net/deko/veri/_files/52451692584.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16130cda24bb20---kogotewifamaluw.pdfIn PDF document text
    • http://luatsubienhoa.com/upload/ck/files/51430455251.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/86372878680.pdfIn PDF document text
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/362d7ea6531115d9402518a81039c80c/podolakopimefebumokaj.pdfIn PDF document text
    • http://aquarium-kochi.com/app/webroot/ckfinder/userfiles/files/silupubojakuxunubesife.pdfIn PDF document text
    • http://nagymester.com/userfiles/file/44557199200.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/5826249611.pdfIn PDF document text
    • https://noticky.net/akce/fotky/file/taxomizul.pdfIn PDF document text
    • http://ruresept.ru/files/file/53200909863.pdfIn PDF document text
    • http://www.parinet.fi/tiedostot/files/58657187929.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8ed15f6c1dd7706e2563f2a8bcc64545/xabepusuzanotexiz.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160c016e900061---50782683351.pdfIn PDF document text
    • http://fecoil.com/userfiles/file/70888024439.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160d52f6f39894---lesovididafan.pdfIn PDF document text
    • http://ilkemymm.com/image/files/xesudusofibevujikij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=cx5500+polycom+manualPDF 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_off0000b868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB868 15020 bytes
SHA-256: 161ae8c4ee4e447aec7933859a3789af3277ddcaf19b9158c31e9923dc5c46b1
font_01_sfnt_off0000deab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAB 10548 bytes
SHA-256: a7fb4ff67c20a4f995075ed24044aedb75a5c789a4058b2eb7db85c3f2dff65b
font_02_sfnt_off0000f6c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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