Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1482dfcb067082f…

MALICIOUS

PDF

76.0 KB Created: 2021-06-30 19:04:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 47c291ebc58b5f81298ba35a8fd2ffcc SHA-1: bbc23d2f0013c9e0382d0b65d11eea249528f52a SHA-256: f1482dfcb067082fd9989f7fe5319be283a4623eaf7ecb88e3fbe5166dcae4a9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, with numerous URLs pointing to compromised WordPress sites and other potentially disposable hosting. While no scripts were explicitly extracted, the nature of the URLs suggests a phishing or malware distribution attempt, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/c6fd554e8699c5d8211f915fc55f991d/77830442068.pdf In PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/p67b696endsghaoqvcnr3n4fnp/rivavokekovowori.pdfIn PDF document text
    • http://jamessham.com/admin/usercontent/file/79608232116.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0a1a7ac7e---89231671935.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/94723892226.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/420661003.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d72d3616b0d---nodeposapomi.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd9dceb94b---samitepotomunewofekamitov.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/b20acc4a2c87da5ff8620b5556c794b9/mizimawakanobakekematatov.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/18900089563.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/o2jhk2hf87nu5cu5gs2fcj0es5/wanimejemenopavuzin.pdfIn PDF document text
    • http://cga82.com/admin/File/sagepanagerurujeranike.pdfIn PDF document text
    • http://carriewoodfamily.com/clients/5/5b/5b9f2fb360c4065436fb7fe1267c3612/File/pajitokalawuwekowo.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/42fb67b2639e0ccbf178288b4d7316f5/teviziwuvobu.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b81040d22---69660053445.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/kegomorufenevemejijuzo.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/90b5d55b4dfeef846c969fb7cc6c846d/lusuxakidosegejiresenupu.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/16070b42691892---57773224603.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608adebba7e7c---30360476487.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/a2a688be2fdc17070b2bc99101ec8008/gedarugeg.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-6-8/20210608233757576842.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/ab177c92ccd46b4b546af7a39209dba2/bewuzede.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/45272119324.pdfIn PDF document text
    • http://mayfamilycircle.com/clients/5/53/53cd9f4101e72b768929e5daf979c2da/File/34306851245.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/58878607581.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=crowded+house+dont+dream+its+over+tabPDF 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_off0000c785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC785 15996 bytes
SHA-256: 33edbdf2530a97e627cca842f781903415ce80ad4bc16905011fd8f906285f6b
font_01_sfnt_off0000f15a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF15A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010971.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10971 10892 bytes
SHA-256: e0590635fff8d6a34e6c0209457424dbaeb8e14bfb7b4d4ee738498cd95e02ef