Malicious PDF — malware analysis report

Static analysis result for SHA-256 f84bc2a074345300…

MALICIOUS

PDF

88.3 KB Created: 2021-06-29 07:26:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6a6daddaadb44af3c5bb1914dfd41402 SHA-1: 995c8beb9c5fc1d8ca60fd8ad790bfa96b552917 SHA-256: f84bc2a074345300a427bde1f2aca50eea0ba3adb90dfe8b8f78186cb6eb449b
104 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious files. The ML classifier also flagged this PDF as malicious with high confidence. While no scripts were extracted, the presence of numerous links to potentially malicious PDFs indicates a download lure attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9765

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/fm4f12f61s4k0cmmf82vlb0n3v/78541214928.pdf
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160c9ef6519d34---94731892571.pdf
    • http://kgmda.com/upload/files/3342674330.pdf
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eaf4040d47---revusa.pdf
    • http://udokutscher.de/gfx/userfiles/files/wugikojipoxuzikunes.pdf
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c747c2a54d---pojexabimapur.pdf
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b7d41a260d---gusekojutakinav.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3def615a2f---ruvejejidovapi.pdf
    • http://anandtouristcorporation.com/uploads/vazedanepufebizisumiwid.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/3id1gemtq18akn458s4gcreji6/polofemuduval.pdf
    • http://temple.mo/userfiles/file/dakuzowivalujemek.pdf
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/8008a482bd99ec203a2e4c646c68c692/niporanotijif.pdf
    • http://a-swiss.com/upload/userfiles/file/36667018571.pdf
    • http://greatwalledmond.com/ckfinder/userfiles/files/bokudopi.pdf
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/bb4a68a4f947855640ad1551eebcb200/mobasorumal.pdf
    • http://kasintorn.com/images/upload/files/25950226631.pdf
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/5f1273ac8e247c04770f1f09255d8508/volizupowonujuloronejud.pdf
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/36a36965fba05b69f3d2e1b725f3de47/10905333057.pdf
    • http://planetamama.ru/files/file/nasadin.pdf
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160852537425f2---rexefefawewakazegubipugi.pdf
    • https://oumkua.com/userfiles/file/42858351767.pdf
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/83f96df45770886ff4e0a40570011731/zamepumimogari.pdf
    • http://bbpcosmetics.com/admin/upFiles/2021-5/file/77323817967.pdf
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/8aq07tklsmudevq4cvhk1am856/20889006753.pdf
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/jihkoe0nfec6l8pj2e26fi196r/32227880176.pdf
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/c5dfc251f19f91c7c73b9146ef43aa30/75904280828.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=tube+mp3+player+apk+download
    • 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_off0000dee7.bin
acfc032da7e66eb362d060f8bfdfd8f4a713999ce413f0d71b504123bfaf9b1c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE7 17488 bytes
font_01_sfnt_off00010d03.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D03 16792 bytes
font_02_sfnt_off0001251a.bin
7a16c2afe4c460ce2fd03a88bc9f7eeffe2c4c39e15ea3708fe2b028f7882afd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1251A 10864 bytes
font_03_sfnt_off00013dfd.bin
9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13DFD 16092 bytes

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