Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8df806b6d684f5a…

MALICIOUS

PDF

94.9 KB Created: 2021-06-27 22:04:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a6380c166e1c08058f2ef00362dd969b SHA-1: 6724dbf937376a48a641d0bd294bb422f63f6f78 SHA-256: f8df806b6d684f5a60eca5c53ee516970b259f70d2ef7f602801066a5a937a21
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as containing a link farm pointing to compromised WordPress sites, and ML classification strongly indicated maliciousness. The ClamAV detection confirms this, identifying it as a phishing trojan. The embedded URLs suggest an attempt to redirect users to malicious or phishing content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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 http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ad0dfc393c2---9136738882.pdf In PDF document text
    • http://laclonghotel.vn/upload/files/68341408987.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/0c8eaf4f82c94a4d24e2b16688578c49/nutomogitoru.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc24c0d26f---39473442611.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1c4098857---xelopel.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d509d8b5b2---41772106117.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/a57d00d34406c997cb5d3fb267d846de/6741354301.pdfIn PDF document text
    • http://nextgt.eu/uploads/file/85844830850.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/0b9f904ca04a635cbe9cea9763c3dcf8/numowozimodelasimer.pdfIn PDF document text
    • http://mcelvain2020reunion.com/clients/b/b5/b5167212b805812c9439186484f80f5e/File/sapifitago.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/8251447106.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/d01ae61efd55d06fd5ef3a97eb967295/68293294803.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/zujadesolelelovasevamefep.pdfIn PDF document text
    • http://aimic.com/userfiles/file/kugajokusexo.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16087fb506c71c---52196259870.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/68632997534.pdfIn PDF document text
    • https://watertorens.nluserfiles/file/22618659977.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087d969ad4f3---sedowanuloreruroxedotuku.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/jl1m1kgujgfui052ij8fgoq5as/piximixeb.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/12007200156.pdfIn PDF document text
    • https://poldercuptrofee.nl/site/admin/ckfinder/userfilesfiles/51308458090.pdfIn PDF document text
    • https://atasuorganiktarim.com/upload/ckfinder/files/43861613458.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a38e2cb8fa5---3757790131.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160abd8faa648e---ribakaranafit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=what+does+it+mean+when+you+get+a+random+ringing+in+your+earPDF 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_off0001112f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1112F 16716 bytes
SHA-256: 1b23604f9a268a2a56ddd644c00bac9befa81534cb2b5bebe26bef7858eceb21
font_01_sfnt_off00013c96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C96 10944 bytes
SHA-256: 91ad66dc0910df151529d67fc72c1034d96848aa97689fa75508fcbfa8462875
font_02_sfnt_off000155a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1