Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc24019b9fbccb7f…

MALICIOUS

PDF

87.8 KB Created: 2021-06-28 23:28:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4e03fdad5b3c1ac9c042672ca881da73 SHA-1: 49f9039d0a14c1091d6d2e18cd4f6f0dbfbc56a4 SHA-256: dc24019b9fbccb7f617c3cb9e9306fed3f2fde0df3778a844411ce3e1182a100
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many of which point to compromised WordPress sites, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the nature of the links and the PDF structure align with common phishing and malware distribution techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://praguetransfer.com/files/file/80535621499.pdf
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/7a7b7775c66a987276e5bd2e4ce60925/dirubemokir.pdf
    • https://elbag.net/wp-content/plugins/super-forms/uploads/php/files/3f61d6c6445a452d2ef62d4ee94958a3/gufimewejux.pdf
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8fd598f501---xebetolasivos.pdf
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073f05aba981---xiwabakogoxo.pdf
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/5714fd66bdacca59de6763378359b2c3/66352187530.pdf
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16087d331a3724---41153130815.pdf
    • https://dubaimotorcycletours.com/uploaded_images/files/tapuj.pdf
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e486fab5b1---luzijusaxosikud.pdf
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/8fcc16f92a17a4e4b8214abe0b96ad2b/59415312186.pdf
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/6e08c375f80b409d23e4ad02f7fe4275/893629010.pdf
    • http://planetamama.ru/files/file/27854324600.pdf
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/7f3376df1273baf9e0c0b2db9513a6cf/vafuxowubopipikejijazo.pdf
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f9d6b76dc---pulopepusenebobel.pdf
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/abfe44fde99890dedaa98d43a389ced0/78283020147.pdf
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9b230c4bf---5037280973.pdf
    • http://icltindia.in/userfiles/file/42687952315.pdf
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b12e72bc40e---33192374719.pdf
    • http://martonaroniskola.net/userfiles/file/nipatit.pdf
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/ojoa8q99ufhomev6si21ia6sfq/41414676551.pdf
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607d57911dbbe---tamepomudu.pdf
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/j76j2mesig6tb1b17to6h714mp/74543906354.pdf
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160908cad18bdb---pomokapogopomabot.pdf
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2371d80906---vufutowanilu.pdf
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a35e141c68---memenoxasisakuli.pdf
    • https://greenline.bg/userfiles/file/83975382707.pdf
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082311dae146---25839818270.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=merge+pdfs+software
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f316.bin
e2d63b457d95e80324b8acf080be2f694baef3c23d1e0dc0403b37e9eaccf4c2
pdf-font-stream PDF embedded font (sfnt) at offset 0xF316 10512 bytes
font_01_sfnt_off00010aff.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10AFF 16792 bytes
font_02_sfnt_off00012311.bin
4ec1320408579a75ac83de7524a4989a0d61065f26518845fb5064725b0aec36
pdf-font-stream PDF embedded font (sfnt) at offset 0x12311 17344 bytes