Malicious PDF — malware analysis report

Static analysis result for SHA-256 caf5606e83cd0b85…

MALICIOUS

PDF

98.7 KB Created: 2021-07-04 01:22:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2db40fccbbd7a7f53a4df36181833679 SHA-1: 4bb3bd351cc69e0cc46e16e39cc11d8ac9eeff02 SHA-256: caf5606e83cd0b85383da5e1e8a247f6bc75147d76bd52bac6222c094f311cd0
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which point to compromised websites or use disposable hosting, indicating a link farm designed to distribute malicious content. The presence of 'cmdc9smbuj5/sivolexovi.pdf' within a URL suggests potential command execution or a lure for a specific exploit. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9784

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://acronimocostanzo.com/userfiles/file/wakutevanudapuravos.pdf
    • http://parbatsamajjapan.com/img/files/files/81334901613.pdf
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/2ab1qm49bsc3e7jcmdc9smbuj5/sivolexovi.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/frcfth7dobdfh03f7uveapar86/tagefuzibet.pdf
    • https://opsclown.it/ckfinder/userfiles/files/jazominedubovujoken.pdf
    • http://bobas24.pl/Upload/file/86211438014.pdf
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/7b1b9e9c4a46272c2a1f0bb545b99c51/koxozux.pdf
    • http://zonweringnederland.com/ckfinder/userfiles/files/35310005291.pdf
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160780f758f0ba---51865746391.pdf
    • https://loyallcanada.ca/editor_files/file/turejelagoxikoxurezidig.pdf
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a893c04be02---juwegutazusevimi.pdf
    • https://ecowaytechnologies.com/ckfinder/userfiles/files/80932202666.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c324396ab2b---91489803854.pdf
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/b8c2942a3ee1af77396efc2ce230ca90/mufudisagirapuwotomajo.pdf
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5e693905e5daf8c37f84c9c27bb9e42b/43439601007.pdf
    • http://perfekttorun.pl/pliki/68983209270.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d66fe9e2582---vebija.pdf
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3d5a55fe8---vinazeka.pdf
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f11716b19---bugowewoniwi.pdf
    • http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/vemawefinorijuligiloweje.pdf
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/691ahi7dpii1q83cqo9lemo2r4/baliwozudatupizosineru.pdf
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607865c5d3298---23677018125.pdf
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160708ced4f792---52548890484.pdf
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/a637bcd87fed8f4d3b8372bfab27e2ce/63772576210.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608798b09d13c---wekozinavogufuwo.pdf
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16078de2d30dd6---lanigudibukufaj.pdf
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/9t9digfqavsecvag4pmcbis168/vewudagabexutodape.pdf
    • http://www.sunargrup.com.tr/wp-co
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=cost+accounting+14th+edition+carter+pdf
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000118ff.bin
ff9f2c528a3b19be0ee04e1e9231070c3561daced588c80e5f0c9d6961df7847
pdf-font-stream PDF embedded font (sfnt) at offset 0x118FF 11116 bytes
font_01_sfnt_off000132c8.bin
6bfd49101426900edd7ada28caf51c6a1d052305dee5b957140cc4614488ed74
pdf-font-stream PDF embedded font (sfnt) at offset 0x132C8 18836 bytes
font_02_sfnt_off000164ea.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x164EA 16792 bytes