Malicious PDF — malware analysis report

Static analysis result for SHA-256 f99b83ff45c0cd82…

MALICIOUS

PDF

102.8 KB Created: 2021-06-26 11:16:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9473a67d1e06cad03dc08260a2a9805d SHA-1: fd0ee96d636c7394569528d179d20affb609fdb1 SHA-256: f99b83ff45c0cd821cf4b6e949962c4c2b97bb256250904034892db4f1a724ae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to obscure the ultimate destination. ClamAV and ML classifiers strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9910

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 http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wukusamowimebezipuwegeso.pdf
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/jan1tdll4p70i03f0fiha0ps75/jigotorimiwi.pdf
    • https://samngaimarble.com/html_upload/file/42257975705.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee62e3ed9c---jovunosewi.pdf
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160976b477f464---33208806165.pdf
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/53eea9cd6a7f65eb4a187cdc75e90d7f/libez.pdf
    • https://promise-land.com/upload/file/gurufazebun.pdf
    • http://studiotecnicodavico.eu/userfiles/files/4776913053.pdf
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160bd3bdba2365---bewikiregozuniwibefim.pdf
    • https://havanic.com/cache/fck_files/file/jesavumusofulupetofama.pdf
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609510c4446fd---banego.pdf
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/a5ea09759a5c49356a2777c7d52150c0/pefuzalorejo.pdf
    • https://carlojans.com/cms/file/naxanigepudosemekad.pdf
    • http://xn--80aamdqpfpr.xn--p1ai/upload_picture/39458868149.pdf
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/7a5fa5d54e0f8128eaf8675fc702e30b/70408696178.pdf
    • http://daydreamspin.com/userfiles/file/81159897577.pdf
    • http://xn----8sbxab3abskk3a2j.xn--p1ai/media/file/66234846280.pdf
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160c181a523882---5456694197.pdf
    • https://detmers-kontejner.hr/files/48810536883.pdf
    • http://aivieksteslaivas.lv/userfiles/file/75836152361.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160736ef8dc2fc---navavunupu.pdf
    • http://alphabodysupplements.com/newerac2c/userfiles/file/murikusebegasawikisafex.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=median+salary+european+countries
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010649.bin
c6c5d7ccc5a3d8ce3ee5858ec04dcc1f4c340bff39696a752d4f7121aba89e67
pdf-font-stream PDF embedded font (sfnt) at offset 0x10649 31308 bytes
font_01_sfnt_off0001547d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1547D 16792 bytes
font_02_sfnt_off00016c8a.bin
5b3c947262022625ef2d4cfb2d0fa10a94f23c97611fd4c7364bfcc62a76ce6a
pdf-font-stream PDF embedded font (sfnt) at offset 0x16C8A 1732 bytes
font_03_sfnt_off000174bf.bin
de4e2f628b9ae65d8dd3d2f405df253510feca17731fcef7146cdb52ffc73094
pdf-font-stream PDF embedded font (sfnt) at offset 0x174BF 10712 bytes