Malicious PDF — malware analysis report

Static analysis result for SHA-256 e66bb2e3e72d40f7…

MALICIOUS

PDF

92.1 KB Created: 2021-07-18 14:58:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 757565814512c101993d8485298a924b SHA-1: 527af0f95addfa0d60553dd6baac2285d89f0eed SHA-256: e66bb2e3e72d40f7795afd4e8ae2984f355c31639c6be3d737683c4d10424327
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm directing to multiple URLs, several of which are hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://minhkygroup.com/luutru/files/wasigaxunabifowafaw.pdf
    • https://pet-fashion.ro/mm/file/tijav.pdf
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ffb285242c---pivovazemigusakuzilup.pdf
    • http://studiolegalezullo.eu/userfiles/files/96845319789.pdf
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/9ca39691506ce0a3c31ae6539ffffd4e/raledafopuwexekadosusulet.pdf
    • http://jnnycc.org/userfiles/file/26421119349.pdf
    • https://artbynela.com/uploads/file/juxasajunowozimusaroz.pdf
    • http://nextgt.eu/uploads/file/kolasulumavomulajeranidej.pdf
    • https://rubenferro.com/userfiles/file/segajaxipodo.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e91f74a7c5d---7520053268.pdf
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/r4fn9p9n6ooc18c8ctc4nkpqhq/tijolenonelo.pdf
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/73a8ec74781624781859703f66b7d3ed/wozuxokaxuwatepemijoza.pdf
    • http://www.deopendeur.org/imgUser/file/30407200416.pdf
    • http://hkalc.com/userfiles/15033187342.pdf
    • http://nfrostov.ru/upload/files/zesifonupalane.pdf
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb7d41e197---29888975085.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607abceea157f---sabopoludef.pdf
    • http://asja-doll.ru/userfiles/file/dilolujapikexokoxe.pdf
    • http://americandeliorder.com/uploads/files/wedibokajujalikekeroxurug.pdf
    • http://lideparts.com/userfiles/file/1623128490.pdf
    • http://matkinhantai.com/luutru/files/38258553937.pdf
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/3loadtm42evdi4phqcv85t7t4o/93608747535.pdf
    • http://elencostruzioni.it/userfiles/files/34454425294.pdf
    • http://tuhs1970.com/clients/a/ac/acc339db084e87cdfae31a76a6c96f1c/File/tabibojenabij.pdf
    • http://obasekiestates.com/UserFiles/file/darawanadedisuk.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=stewed+apples+thermomix
    • 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_off0000ecb9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xECB9 16792 bytes
font_01_sfnt_off000104d0.bin
6222b4a39a9eecb22805c17ec6e07c6eee255f6256fbd875366bda67addd1a48
pdf-font-stream PDF embedded font (sfnt) at offset 0x104D0 10816 bytes
font_02_sfnt_off00011dc4.bin
7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC4 16312 bytes
font_03_sfnt_off000133cb.bin
e09c0033f2060fc3267dc7bd44d541f973ce7e3106d6ec4ebbdb86c11a694ad7
pdf-font-stream PDF embedded font (sfnt) at offset 0x133CB 18080 bytes