Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a5679b53dc2013e…

MALICIOUS

PDF

88.1 KB Created: 2021-06-27 11:00:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1282e0bf939468bed3a20103f535c3d0 SHA-1: 2ac88622b679904f829e2f033e247a3fcb5ed7a2 SHA-256: 1a5679b53dc2013e3393140c652c334d02af2b780cb65a697acffba5186bcaa7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with PDF-based malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://huntic.ru/uplcv?utm_term=class+10+sst+previous+year+board+paper
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/59472156160.pdf
    • https://iguanapools.com.au/wp-content/plugins/super-forms/uploads/php/files/pg16kaer4fk3spnett0q1sub0t/43397539325.pdf
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16076c133de2b1---piwolen.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/8f240316b69b25e933ded1c7fb173acb/roluredigedapakenulib.pdf
    • http://cascinamana.it/userfiles/file/95495918915.pdf
    • http://bindashnews.com/userfiles/file/vujebubor.pdf
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/nho4hj3pfgg5rh8i9u4euh1q70/86327043782.pdf
    • http://automsystem.com/UploadFile/file/20210502212453626.pdf
    • http://atenngo.com/admin/sites/site/documents/zifan.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/04ab3355be9e287d0242a291b2c2b399/dozokugi.pdf
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/f5af4141657514db057ccfebf62ad0e2/14642121945.pdf
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c51f043044b---47900274914.pdf
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607d901156380---78746052328.pdf
    • https://tomas-music.com/contents//files/rularapivojowavewusovix.pdf
    • http://s8radziejowice-paszkow.pl/userfiles/file/kivakozu.pdf
    • http://domusanna.it/userfiles/files/24573351208.pdf
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608240785d5c3---95943094542.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160826a38a502d---14058793023.pdf
    • http://zuche0551.com/upload/file/xupoxejuxaxi.pdf
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160aec1f161c2d---88817757397.pdf
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/li1qi0jvms3kb40mem3vufjcb6/18395142553.pdf
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160945f6d384ce---22318293722.pdf
    • https://textolinguisticsolutions.com/upload/editor/file/rusevo.pdf
    • http://lamekatus.ee/uploads/ckeditor/files/kituporunibuzowijut.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_off0000f4de.bin
0cf35ba295a33eca7566e8e5e1e573be2e890d87894a20ddb147725c6d780e8f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DE 17144 bytes
font_01_sfnt_off000121a5.bin
b83a5cd2d6c408e37283c4665b36fdf6b885b1a15c07ca9da4e59bf4b02af978
pdf-font-stream PDF embedded font (sfnt) at offset 0x121A5 10904 bytes
font_02_sfnt_off00013ae5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13AE5 16792 bytes