Malicious PDF — malware analysis report

Static analysis result for SHA-256 42133c942389ca41…

MALICIOUS

PDF

82.5 KB Created: 2021-09-06 16:17:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 22b98a404f0368bab43655e892ddb5ec SHA-1: d0dad50586896849a9995ffe88884961db7bf5da SHA-256: 42133c942389ca41e9227e0fa9740969af0911a6ed79be475afe702c30873c35
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 ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, with numerous URLs pointing to external sites, including those hosted on compromised WordPress installations. The primary purpose appears to be directing users to potentially malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://queure.ru/uplcv?utm_term=vertigo+exercises+pdf PDF link annotation
    • https://sedefartphotography.com/resimler/files/bonubukupegu.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161272f09baacf---lawazafepijazenemig.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160790a1231a95---sarabuwibinevebekowukozu.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e891cd9bbb2---redibizulopemaraj.pdfIn PDF document text
    • http://reylab.com/userfiles/file/31866926152.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160815e68119ee---roxog.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/r9h45isfsd8g6b0i4ovnn71bo0/99507262579.pdfIn PDF document text
    • http://worldnaturalfood.com/image/upload/File/tuzonefutotus.pdfIn PDF document text
    • http://stellarp.com/userfiles/files/xukapetepudapedum.pdfIn PDF document text
    • http://grandwatergatehotel.com/upfile_hotel/files/setotorubixumewiledam.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b71fd7741---35844075473.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/bobibazozajuzupovogis.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/c91a4075957cd6027e1afeb64ac0c2ef/32709655283.pdfIn PDF document text
    • http://bfttacg.marketsearching.com/upload/files/gamobujafenu.pdfIn PDF document text
    • http://superplasticizer.cn/d/files/fifutakisew.pdfIn PDF document text
    • https://aravlicraft.com/cmsCart//upload/file/kitanub.pdfIn PDF document text
    • https://korzo-galeria.hu/files/file/nosonofolojobopodo.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16127f3c5e48f2---46661276003.pdfIn PDF document text
    • https://dwitunggaljaya.com/sitefiles/file/53011011085.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/wumonewexegaxuluti.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/e2qbjgcf57j6sktu87bi0esfvc/metusenenixa.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/bomagirinidovokupa.pdfIn PDF document text
    • http://daotaonhaccong.com/uploads/userfiles/file/21672050055.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16111fc34d5d53---97996902241.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610ef34698c45---telipesi.pdfIn PDF document text
    • http://racecross.com/upload/edito_fckeditor/file/60739946535.pdfIn PDF document text
    • 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_off0000df49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF49 17564 bytes
SHA-256: dc71db6d6ce155b7f9f35e269a8d9148b4ba4077861daedc1857aedf70040370
font_01_sfnt_off00010c80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012497.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12497 10552 bytes
SHA-256: e6c757b4021c8a6f7d12928adf2f6f8f428ccc1224170846ee11b2a1dcd50199