Malicious PDF — malware analysis report

Static analysis result for SHA-256 52c2fd1acd5847e7…

MALICIOUS

PDF

86.7 KB Created: 2021-09-08 02:34:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: bd910b4028fdd82042a924eaa8f705be SHA-1: 390f515ea29058487e8ab2a9be1ba8be867eebd6 SHA-256: 52c2fd1acd5847e7419a5365aa3d1c7f2642fa4893380447eb15525705d9f0d9
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the link farm behavior and heuristic firings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://novitas.ro/files/fusun.pdf In PDF document text
    • http://feach.ie/images/uploads/file/jaredojefavimotirif.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b43bd7d58c---41842960846.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/57c70cd94e77eb544c260fcda38cb8d0/16649891679.pdfIn PDF document text
    • https://koratspring.com/upload/file/xosenanuj.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611c452364969---dajonefo.pdfIn PDF document text
    • https://osiindia.org/ckfinder/userfiles/files/32243423089.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b93e81b28---tipulesibojozetagirugud.pdfIn PDF document text
    • http://signauction.net/userfiles/file/giporisinusiv.pdfIn PDF document text
    • http://atomicattack.com/atomic/fckimages/file/sulexagurovavadup.pdfIn PDF document text
    • http://xn--80aafmoni2biho.xn--p1ai/admin/ckfinder/userfiles/files/37812727083.pdfIn PDF document text
    • http://siembra.me/uploads/files/bazanutifemodowukipoja.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ba697bed527---42184172416.pdfIn PDF document text
    • http://usa-ex.com/images/blog/file/gameguk.pdfIn PDF document text
    • http://qataminational.com/uploaded_files/userfiles/files/76447707082.pdfIn PDF document text
    • http://askort.pl/Upload/file/36851949799.pdfIn PDF document text
    • http://ubestsports.com/imager/files/20210816030655.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2af103ff1e---95180511209.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/d8eb000febdf8fa68345f0875b505465/88171221872.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd43fdb9f77---wijipogamowobife.pdfIn PDF document text
    • http://union.travel/ckfinder/userfiles/files/90990610524.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/likebutisasafoduz.pdfIn PDF document text
    • https://arerp.kr/data/file///figolekadudebipifotebe.pdfIn PDF document text
    • http://a-pluset.com/userfiles/mugojiko.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/jekukonurik.pdfIn PDF document text
    • http://blueyee.com/upload/file/170253511771.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=pipeline+engineering+books+pdf+free+downloadPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDB 10896 bytes
SHA-256: 36097d93d0a1f0933606e234d40c4226d4e0ccc402031bfdf474b59a206cd2c0
font_01_sfnt_off000108c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120DA 17228 bytes
SHA-256: bf9013b19559fe540de637d03895fcc19a3be26226a64f54a9b1326515681dfe

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