Malicious PDF — malware analysis report

Static analysis result for SHA-256 95357dc6ca33695a…

MALICIOUS

PDF

86.2 KB Created: 2021-06-29 17:59:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: de545baa55dc9c3c22c96f8642b0a3d1 SHA-1: d69140bb5b0edacb29a4e598731bc5417c3c5fc0 SHA-256: 95357dc6ca33695a271fba03dce28d816d5bd6b434c561505b2dc6f28c0ccf9b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, many of which are hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607d73813637b---jowudalajuxebevowukonolu.pdf
    • http://extracam.es/app/webroot/arxius/file/6509324107.pdf
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/hpjaek7cgih83tj1v25r85nuoi/josopotezopexojitekikemeb.pdf
    • http://xiaohecollege.com/d/files/23698569247.pdf
    • http://jrmhandling.nl/upload/file/48813136850.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071e43bdb36b---71457852955.pdf
    • http://szrealty.net/uploadpic/2021-5/file/2021051615574473499.pdf
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/9mbt0dmesldueuteur5itdraq0/kezopifasisonofuvaxawoxiv.pdf
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609793d53b27f---52039762684.pdf
    • http://maszyny.pl/userfiles/file/15930132407.pdf
    • http://uniroll.pl/user_images/file/tekizen.pdf
    • http://hwayinn.com/image/files/20210615_214218.pdf
    • http://kaies.cn/upfiles/file/nodebupobuvi.pdf
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160b0149fe6057---37727669675.pdf
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a47bf78f754---pelisenisenin.pdf
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/risofizimusibire.pdf
    • https://apotekatia.ba/fajlovi/lamesifukuwu.pdf
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a46a01f14f5---jowiminidizuxatixabesoma.pdf
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/513871fd7a3bf5674d3a7d86ece71389/63298479580.pdf
    • http://demkapi.com/resimler/files/wadejexu.pdf
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607879650a1e5---fiketobevofomos.pdf
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aed326513b8---49080484994.pdf
    • http://alpha-th.com/userfiles/file/61056766315.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+get+into+the+back+gardens+untitled+goose+game
    • 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_off0000eb38.bin
fee3e237ca16a7e2068b7d8e335f1f74c99a802ef9a325b2cc0dff3c9b1099a9
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB38 17876 bytes
font_01_sfnt_off00011966.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11966 16792 bytes
font_02_sfnt_off0001317d.bin
d5d78467fb18f45d8dcf2cca041396a553483ad65a924a719af1e42df9ddbac1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1317D 11224 bytes