Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3ad71558d521d43…

MALICIOUS

PDF

84.1 KB Created: 2021-07-22 10:08:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: cd8397c8df27b0150ecef28465cee771 SHA-1: ddcfadc6e79e79b99881c0753a6c438597e58e29 SHA-256: c3ad71558d521d43379c8502645f28201eeabd04672a92cc63c304061b9d0cd8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating it is likely a phishing or trojan delivery mechanism. The file functions as a link farm, directing users to multiple compromised websites that host further malicious PDF files, suggesting a multi-stage attack. The URLs point to various domains, many of which appear to be compromised CMS installations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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://airholic.com/UpFiles/WebEditorFiles/file/lakadupa.pdf In PDF document text
    • https://pt2-turbo-j3t.com/contents//files/16510362838.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607c11afc4ee5---lavisatuni.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/f09c9c3214f678f616d4b1d9288ca475/fikarefakavokasovab.pdfIn PDF document text
    • http://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/diwuvopikorap.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/62573757280.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/8a2e28b45396284df7d4accf7757e8d5/disamejafonozosomixazuli.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/672950afb1b9e9fae06694a584f443b2/82256111934.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed9ad6a3b30---61820235607.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a5bf05761ce---wukaz.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a31ff5d4b47---19766990131.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db182b8618d---botesuk.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160879e8b4b74d---73360358161.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/wijaxisibokux.pdfIn PDF document text
    • https://tasleemdubai.com/userfiles/files/53244650271.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/nefedozig.pdfIn PDF document text
    • https://tavio.ru/files/file/32060167282.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a271b68ff---dodorixotagigaju.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a908478a8d2---lanowefezegipeb.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ac47f46dafd---jesemalom.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/cpu5ketguc6oa5g5mapvpq9iu4/gunanotefaxakogovufuko.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/vivefubozulojapag.pdfIn PDF document text
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/vetinironefenegezik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=organizational+behavior+for+managersPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e960.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE960 10952 bytes
SHA-256: 86da1facbfa07949e7ebcb67449f56d527da4eaf66a72d425203fead0b26a6a8
font_01_sfnt_off000102ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011abf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ABF 15728 bytes
SHA-256: 5aa53a7d78619ca57031a21445da8fd1518bf65d092b936f7558c7b9cb9e92c2

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