Malicious PDF — malware analysis report

Static analysis result for SHA-256 38d14b1d589041b1…

MALICIOUS

PDF

110.9 KB Created: 2021-09-03 01:21:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5be5e8d2e641d09f6350d907030717d4 SHA-1: 64be251397739c04ff6941e5a3732c01dec90168 SHA-256: 38d14b1d589041b190636e064d7685fc7b4ff8210469bbd010c382261aa21f94
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of external URIs and the nature of the heuristics strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9863

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://cructi.ru/uplcv?utm_term=the+good+wife%27s+guide+a+medieval+household+book+pdf PDF link annotation
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160bef5a017dc1---weforitopupalototifo.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/kolizofaxaposejofe.pdfIn PDF document text
    • http://www.flamanville-76.fr/upload/file/ligijanizapabakina.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///15084317860.pdfIn PDF document text
    • https://harom.ro/files/file/nifem.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/e5751139c14e9bcba7f080dd0a713b24/nowiz.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160949cd1bb2da---wivojamazit.pdfIn PDF document text
    • http://industrialdevices.in/uploads/72841529597.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160af82f38a29b---39509500488.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/dnobbfnttjh86no13nvrj4hmur/zufapafodaruga.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/cggmue5m3h9bk95omi1bun0662/dowoba.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609d66eed37c2---16602747897.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160724ff1ca4b1---togokijusidutewotusud.pdfIn PDF document text
    • https://bakwanudang.com/contents//files/97879120900.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfeab176317---zixiped.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b844e9c3f28---23425892937.pdfIn PDF document text
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/41066837586.pdfIn PDF document text
    • http://ventexevent.se/uploads/file/95471858003.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e25e0c6ce20---vobelugilizuvapewu.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/15054123015.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/5fi1hfct3q376orke32elksvtp/wizovatawadibon.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608b18d1d960d---36677068840.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/b3d87693f6b8a0bdc29c2416eb3cbee6/62872977349.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c05f4ae66---17450076921.pdfIn PDF document text
    • http://massintech.ru/img/outer/files/1314811025.pdfIn PDF document text
    • http://superfasttv.com/uploads/files/wifigosogike.pdfIn PDF document text
    • http://iehyun.com/editorupload/file/3709741700.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/eholein3ko4hdanncsls8kfvho/95307659650.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_off00014659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14659 11124 bytes
SHA-256: 22f8863e4cee010f0abc2f23bfae5ea436449bc4a089cad776da7cd5cdc31d3c
font_01_sfnt_off00016001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16001 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17813 19560 bytes
SHA-256: edc1cbbde53cb1923364c58c2e17238b0ffd939febe7670ed74ca09f06a26b0b

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