Malicious PDF — malware analysis report

Static analysis result for SHA-256 a534a0a6385568c9…

MALICIOUS

PDF

82.4 KB Created: 2021-09-05 12:43:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3d106ad1f8fd13ae2e66e4cb821fe1fd SHA-1: dfc492edb7751e6ba91119717657f528f1e4955b SHA-256: a534a0a6385568c93d7ccd6b6c57136a00e14ded506348a1d2f1ef503d7d924c
156 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 websites, suggesting an attempt to distribute malicious files or redirect users to phishing sites. The presence of 'administrative manager cv pdf' in a URL parameter indicates a lure for job seekers. ClamAV and ML classifiers confirm the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://tiszaladany.hu/upload/file/lijefefa.pdf
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cb0fa27c8---dopezavigoletadusotorunu.pdf
    • http://xn----7sbezcba9a5aggb3j.xn--p1ai/ckfinder/userfiles/files/dukoxasevim.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/l303tmfcshmbfnu0735i9o2017/tajime.pdf
    • https://eminencesolutions.in/resources/userfiles/file/24522455205.pdf
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a43990edf56---gosajosutulikoxo.pdf
    • https://baxsporthorses.nl/userfiles/file/pomalewesa.pdf
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c7859e2adde---61944334028.pdf
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/2omdc6d26rl91pop9tj3fp6di0/nejisetavofegiwo.pdf
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/5ct1o59kk15i4i2oapo4ktju1d/39402250758.pdf
    • http://nexxosrealty.com/userfiles/files/95917705822.pdf
    • https://autotronics.vn/userfiles/file/wodewadugiliviki.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bbf991d7d82---15715837387.pdf
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607924c03f94c---genutaripibobar.pdf
    • https://www.smartfutureexpo.com/ckfinder/userfiles/files/biboto.pdf
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/hobo5096odcmqbmg4a7q57a8as/jusuwesixu.pdf
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/nf5dth2nh8pqm7lqlbtpsj0d8e/lefofejerubipufuvi.pdf
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/e6508c584479ae870a6fb1ade60eb54d/repijazunulotiximemopud.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084c760e85c2---66337840668.pdf
    • http://imailbox.nl/images/uploadedimages/file/93823021561.pdf
    • https://aawyx.com/sites/default/imageuser/file/73065026177.pdf
    • https://alharithiforcameras.com/ckfinder/userfiles/files/31597517731.pdf
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zuxilonel.pdf
    • http://vagtteam.com/userfiles/Files/tafusuna.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=administrative+manager+cv+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_off0000dce4.bin
e624fb2ac5612fa2422ed2e9b2a18862094c0b4a228e2eec78fe8113e7d9a84d
pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE4 10844 bytes
font_01_sfnt_off0000f5b9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B9 16792 bytes
font_02_sfnt_off00010dcb.bin
17e987643b4e172d111d3fb7db00ccdaf36a6836ebe96fabcabf7f1d62ba5ece
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DCB 17916 bytes