Malicious PDF — malware analysis report

Static analysis result for SHA-256 2efbf2f83645f8ae…

MALICIOUS

PDF

130.5 KB Created: 2021-07-27 17:13:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f0a38c1cd4f908aab2e3f0ca706a5558 SHA-1: 74bab69397b829b2360136ff9a31d386b5da286b SHA-256: 2efbf2f83645f8ae257610d53480d4e779c6a64bbd5d6a39729f5523df91542f
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document functions as a link farm, directing users to numerous external websites, many of which are hosted on compromised CMS uploads or disposable domains. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings indicates a strong intent to distribute malicious content or phish credentials through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/04930cbfb09ca6bd0976c1c34d396611/57841848566.pdf
    • http://handbook.hu/upload/page/file/gefiforaripikavaliju.pdf
    • http://vce34.ru/attachments/file/vafexodor.pdf
    • http://pressvaluation.net/userfiles/file/87698389202.pdf
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/180ed68e83398b67052889a074d31c27/22367738780.pdf
    • http://americasbestwingsbeltsville.com/uploads/files/64656286140.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/6i8l0m0bq8rjkqj4cq0cmqksa5/41515520268.pdf
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/b6adf778490bb296ab0fafde2b0a0c69/zatesor.pdf
    • http://midel.me/userfiles/file/deliwatofebizadavixirez.pdf
    • http://esthebel.de/userfiles/file/27725089247.pdf
    • http://kraski-chernila.ru/resources/file/95086053333.pdf
    • https://dukeofmarshall.com/ckfinder/userfiles/files/wazekiwujiwa.pdf
    • http://allmedicus.com/userfiles/file/53032171294.pdf
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/213ee0fd7bb293d82fcc41972ccbb985/jaxazizadijojogomore.pdf
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082f727c37b2---4119071562.pdf
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/oaebdvr2tvnc8hfo2168sslosf/bazuvoba.pdf
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/1b9c822232729d6584bce7be23574522/5397934842.pdf
    • http://red-persimmons.com/upfiles/editor/files/napadixekijuniv.pdf
    • https://virker-ikke.dk/files/fugofekuletodavif.pdf
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/9plngn11uplf8o9aqf28og3205/63944702312.pdf
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8504e6b15---nupedibosilotoxez.pdf
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/a5fa38780508d296ce9e737e97ea7f5a/nopabolitodanaxamavedasa.pdf
    • https://ip-kamera-rendszer.hu/ckfinder/userfiles/files/96869793253.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ee45d10f601---giratesuwuje.pdf
    • https://vegan-eshop.cz/data/file/30959817130.pdf
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/309d2b60a43e971900fd41eaed10bc1c/rofumoses.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=enzymes+catalysts+of+life+virtual+lab+answers
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • 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_off000185e3.bin
505f1f16fb057e2a34e7666bb0a43a50f2e0b7bc0033e59b70183295ac12d2e9
pdf-font-stream PDF embedded font (sfnt) at offset 0x185E3 16100 bytes
font_01_sfnt_off00019b1b.bin
7b1f81421090d978b9a3deafa5eede7c4b94604394872fcc5563e4bbb1d10680
pdf-font-stream PDF embedded font (sfnt) at offset 0x19B1B 18780 bytes
font_02_sfnt_off0001cc3f.bin
d0420061db87f92a1c2c8e262db67010690638f787c384e642d767cb8d3be560
pdf-font-stream PDF embedded font (sfnt) at offset 0x1CC3F 11044 bytes
font_03_sfnt_off0001e614.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1E614 16792 bytes