Malicious PDF — malware analysis report

Static analysis result for SHA-256 25ce326780eb0423…

MALICIOUS

PDF

105.4 KB Created: 2021-08-08 08:42:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 642e3490575ba7550a960d4dbba4aeec SHA-1: dd16ee8d7f3b3f51b82a43b81700cc5d95b2be35 SHA-256: 25ce326780eb04234acb114397b27bd66991af48bbaf2dab808e23458708c5e9
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links to compromised WordPress sites, suggesting it's part of a link farm designed to host malicious content. The 'SE_CALLBACK_LURE' heuristic strongly suggests a callback phishing or tech-support scam, where the user is prompted to call a number. No scripts were extracted, but the presence of external links and the callback lure heuristic points to a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c052b3bbf---65731938231.pdf In PDF document text
    • https://apskarota.org/userfiles/file/77938546022.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/6ec5d753253a829b93041b6716a9bff8/dipafarixabajexosigu.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071c19a5620a---55523465971.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/30de8ec225811ff5996cda1d915ca924/56387222930.pdfIn PDF document text
    • https://kit-veron.my/ckfinder/userfiles/files/mejokutotajowa.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc45ad142a---kudimitivuweden.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16075ab0be1bae---defuzuxazaxazokid.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/ad077f5da5740d06c4656d09e7f63ee1/mebizadapuw.pdfIn PDF document text
    • http://aczelzalog.hu/tmp/lofozakukefawuwusuniwob.pdfIn PDF document text
    • https://mayxaydungthienlong.com/uploads/files/files/mapuwixelifaxexuz.pdfIn PDF document text
    • https://pubs-icfas.org/icfas_new/dev/ckfinder/userfiles/files/lirujomoruwad.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/46c3e8402c05b38e86079eda77edee46/zinibi.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/kidomavin.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609463b7a54c7---lewobid.pdfIn PDF document text
    • http://www.abcklima.hu//data/editorfile/gulorewadetexavoli.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3975a627d---rumafolid.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/oc9mg5tbdh2h84nuc3pnrv1ek3/wuper.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/a47f285c51b7ddbf44dbef3514c1d702/sinoxumikolovileri.pdfIn PDF document text
    • http://trendybiz.in/usersfiles/file/69354643426.pdfIn PDF document text
    • https://lifo-sea.com/ckfinder/userfiles/files/14252655119.pdfIn PDF document text
    • http://rainbowcaterers.in/userfiles/file/tobizapasutinurimufe.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/1ipb101s4ims1g67qsp2a1l0g7/tijadovekixek.pdfIn PDF document text
    • https://fallahi-sch.com/userfiles/file/golejerupumom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=excalibur+hotel+las+vegas+check-in+timePDF link annotation
    • https://mediaget.com/userfiles/files/37564627658.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_off00013535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13535 18356 bytes
SHA-256: a3e696c13448503c094c9f803546e248810b239ee3cbfd98df0ddd787ff095ad
font_01_sfnt_off0001657c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1657C 11196 bytes
SHA-256: 56b8acdb2a48ef8f3f0bd7c0f41aafb7741e75ad5f6fa14e7a1701f727813434
font_02_sfnt_off00017fa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17FA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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