Malicious PDF — malware analysis report

Static analysis result for SHA-256 a204acb2e6e24561…

MALICIOUS

PDF

83.5 KB Created: 2021-07-01 21:36:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 42cd8554ac8592fbc582080e38cd8f2f SHA-1: f37dd7b3b6d216f89d38a451ab734d35e6d95544 SHA-256: a204acb2e6e2456177722a3a4a55314d34c95e076f99ff57b641f3babdabe844
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs pointing to compromised websites and disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://allytemp.ru/uplcv?utm_term=a+psalm+of+life+appreciation+questions+and+answers
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/fln12kifs5bqvlg4flm3tlso26/gegisavuzezosidapeku.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/la0jr04hbdfjbhek2th70o3ef6/12984161904.pdf
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16072d7c44b00a---duzalifinokofuxiw.pdf
    • http://maxtarget.by/ckfinder/userfiles/files/xepadoxitobumudoxiw.pdf
    • https://osikovo.eu/webroot/img/content/files/5981617241.pdf
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608f6c72684c9---fewukuwinajavizapiz.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d7c9e0771---bafinorukuz.pdf
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/papogain965co22j0jqtfkpev1/89136769533.pdf
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079e6020b60a---kapajutojebelepanezeke.pdf
    • http://ondrejkocar.cz/img/file/15274108753.pdf
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa06b9379d---63168634433.pdf
    • http://mnarch.it/userfiles/files/91793739676.pdf
    • http://maility.pl/_ADRESuserfiles/file/74547916940.pdf
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/bef2b80eadea249ab8d83d60c68bbdf8/tifenuletebonula.pdf
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a8aebf69f33---67383424011.pdf
    • http://debden.org/userfiles/file/tetigamijofudukude.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606de2750d379---melibegoxugulogebedijogi.pdf
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a1cad44cf0b---sorenegizataduxovi.pdf
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/3150b13d104a955b42fa5dfc7aecc02e/44662505080.pdf
    • https://sce.tw/uploads/files/60bfbc22e2e2f.pdf
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/15034bea76d231ba0f859eb563748b8f/11776915153.pdf
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c99244fc0f---mebesuvizopizis.pdf
    • http://travisreunion.com/clients/1/1d/1d9c560ef9ee6310b862f4c9d288d7bd/File/kidimadisagewuduweluv.pdf
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/2079d8d01524fe78c33da8b6f839d8f7/tolikipagobigupinosu.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_off0000e194.bin
f34a26306c2b13744bdb969646cfa8666d8ea6106c9d3959c0a2a3df2d6e31e9
pdf-font-stream PDF embedded font (sfnt) at offset 0xE194 16848 bytes
font_01_sfnt_off00010cdf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10CDF 16792 bytes
font_02_sfnt_off000124f6.bin
f75502374c416cbf2c47d293fb5a6979eba5acf6977274fbe10808d709a8524f
pdf-font-stream PDF embedded font (sfnt) at offset 0x124F6 11096 bytes