Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ef082ad6b3e80b2…

MALICIOUS

PDF

87.2 KB Created: 2021-07-02 15:29:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3b62eadc2dd3dd233c2867ebe65a856a SHA-1: 186430d18178a8b083c229bae305eb269bf05c9e SHA-256: 7ef082ad6b3e80b2ea96e86d5a5a62dcb80ff764380f4518c4dd34441ba5f3ad
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is a malicious PDF, as indicated by ClamAV detection and ML classification. It functions as a link farm, directing users to compromised WordPress upload storage and other potentially malicious sites, likely to facilitate further malware downloads. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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
  • 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://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/natqt942tj30mndoscqfba7fe1/10390108910.pdf
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba6ea25265---12265341462.pdf
    • http://ipsgroupjjn.org/userfiles/file/mosofikaribi.pdf
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d59e4939dbf---44607614819.pdf
    • http://apexnepaltravel.com/userfiles/file/tiluvubaberedorudapazo.pdf
    • http://shahnawazonline.com/uploads/files/piwupapim.pdf
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160ac26945aee9---nodotukaguwen.pdf
    • http://animationcoach.com/userfiles/file/xedodepibiguvanupufeduji.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16084cf7a10c1f---63599719316.pdf
    • http://imi.vc/upload/files/8390776534.pdf
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160786824cbc05---pazoxoxo.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2a212fe5d---vinodaxuzaz.pdf
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/d15odqg3bf5bugali908kp0l91/20628214527.pdf
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/40b80f4997ef9105a4fded1ed2e74cbd/92980417840.pdf
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/cor6r30o4eal78mkfb7dp8m2gv/42725009289.pdf
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/320aa84d7218735e56ee7bb670c4f1b9/72715511586.pdf
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/jl5cmggob23rudkno14qu7r775/pebomumamapo.pdf
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/1godk3mpeo4a19l9jtf9ik5ksq/dusebegaxulazumo.pdf
    • http://allamericannursing.com/userfiles/file/wujabumefeligosawutaj.pdf
    • http://womensmentalhealthmd.com/clients/9/9a/9a9ccad1be43d50cbc9928f06550b956/File/sewitaxevavebokusonu.pdf
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/rizaluduvobabog.pdf
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c86674573a---zajejipaf.pdf
    • http://kondicionery-vidnoe.ru/upload_picture/file/sipofo.pdf
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f332d165dc---dibedox.pdf
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/b2ecd5118e459060cd269355343f782f/36288085539.pdf
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/b9376052ba4a9d8f9283e6184159f300/80887047552.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=pes+2020+ps4+camera+iso+download
    • 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_off0000f019.bin
fbdc53ded3715e29bb3b9f8ac8f2f8cfc9fe9b6337413e35af6adfb3db2fc0d2
pdf-font-stream PDF embedded font (sfnt) at offset 0xF019 10984 bytes
font_01_sfnt_off000109b8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x109B8 16792 bytes
font_02_sfnt_off000121ca.bin
539d3ecf44b72abcc306c328c128151a79fa8d123660014b3d89783aabb65cfb
pdf-font-stream PDF embedded font (sfnt) at offset 0x121CA 17328 bytes