Malicious PDF — malware analysis report

Static analysis result for SHA-256 efc2f9740d75a95b…

MALICIOUS

PDF

83.6 KB Created: 2021-08-21 20:16:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c94e4dc3d8500dba5f31780ddb670492 SHA-1: 5a28f1259cc39aa3b48669636424028ecbddea68 SHA-256: efc2f9740d75a95b5603985b04fbed742abe6500861d0d8d884c24038becf72c
184 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan. The heuristics indicate it contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 8

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://dabaizhongxue.com/upload_fck/file/2021-5-20/20210520154806664153.pdf In PDF document text
    • https://gotamsui.com/ck_imgs/files/mumususip.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc3e9569fe1---luvezejisefo.pdfIn PDF document text
    • http://1qjd.com/upload/files/2021-07-21-05-42-41-xOMbpZcC.pdfIn PDF document text
    • http://becucci.it/userfiles/files/15498761162.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/userfiles/file/pekozadesinodedurilusereb.pdfIn PDF document text
    • https://gitteszoneklinik.dk/ckfinder/userfiles/files/levulanaforipufixoji.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/8874251bd4460a35bc72876697be23ae/puxamidovupilobewalabi.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160adaed5f0b83---rejorutemag.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b519c00c0---lejopozoxefaxuwewewinibaf.pdfIn PDF document text
    • https://nmg.lv/img/uploads/files/83361481296.pdfIn PDF document text
    • http://unityproductions.com/upload/files/jisexaxoralun.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/33df8de7bfdf4ff07400d2e6b6213810/vomapimedobitiwatuleza.pdfIn PDF document text
    • http://taborcapitalpayment.com/clients/d/d0/d0a3925ee25d0adc8806453b18bccccc/File/13129984721.pdfIn PDF document text
    • https://ingatlanfelugyelet.hu/uploads/file/72150308472.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080c7ae19edf---zivevevamizefebiv.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609df97a2d4ab---29284617213.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083e3c51ba43---nezedekagezixitala.pdfIn PDF document text
    • http://aardbeienfeesten.nl/uploadimages/files/32096459189.pdfIn PDF document text
    • http://jgbt.us/pds/userfiles/files/fabiweradepubez.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/42516055984.pdfIn PDF document text
    • http://ecandrychow.pl/Image/files/zogalakulekewe.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/39625061298.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160985a3030ff0---99975886231.pdfIn PDF document text
    • http://drwatsonsr.com/clients/2/2b/2b9a0cf27321ceab3a47fbd10bf94d34/File/93620046145.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+unblock+sbi+atm+card+by+net+bankingPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7EC 17428 bytes
SHA-256: 9341105baa0355183937233f288dc8dca60ef53bc8e5d4585a98fa22c162eb03
font_02_sfnt_off0001256e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1256E 11236 bytes
SHA-256: 79e67e803c8d557ca5d6c4ee7a712bfa7fae7696fb5cd6418b5b5ee84fcc8942

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