Malicious PDF — malware analysis report

Static analysis result for SHA-256 9afcb0e647339e73…

MALICIOUS

PDF

143.0 KB Created: 2021-07-05 12:09:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 179a69e0e40b928fe496fe8375b621fc SHA-1: 55e65ac0468d5e18d7b75027b8593ac6be122b69 SHA-256: 9afcb0e647339e7373b37e3c2174e4455bb59fc674b2df8938a9e34ab2355a89
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or malware delivery attempt. It functions as a link farm, directing users to multiple compromised or suspicious domains, some of which host further PDF files. The presence of 'password-protected archive handoff' heuristics suggests an attempt to bypass security controls by encrypting a payload. While no scripts were directly extracted, the PDF structure and link farm behavior indicate a likely intent to trick users into downloading and opening malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6649

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • 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://sanphamhanquocymy.com/uploads/files/59107610573.pdf In PDF document text
    • http://csc-021.com/userfiles/file/20210626145716_v9so6y.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///bewularigexa.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/464358dc64d3b5787e3ee628af2d79c5/79588633086.pdfIn PDF document text
    • https://www.kcequipment.com.au/wp-content/plugins/super-forms/uploads/php/files/08153364a21370fe4f27dbf3e39116eb/vanareniraxewijexunu.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/fekawunogakixofusupofur.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/1eba84828efed94634a4992727b48f6e/jilusudemomutuxikunipof.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0a9deb32a---10577590140.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f42422f6d---74188749027.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/zujimesivinororovejit.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b4ca043bdab---sijunosuvi.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d15d09e59---28652073986.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/60cafba51a775a500bebe9652e4bf193/82929023490.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609068e066fe4---76490488350.pdfIn PDF document text
    • http://portalkucharski.pl/app/webroot/media/files/28497822796.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/b926546cf4320d5a701794cfea4dd645/77912126429.pdfIn PDF document text
    • https://argekaucuk.com/nbg/upload/files/muzotemitudekedaxibozuwo.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/a6ade477332be5e954d65a48af589d7d/79591572300.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/c6b118f7f3650181b8dcf1fbc4eaa01c/rejaju.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b3be9611eb1---84495426212.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160863b3ac0784---76841923459.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160991e752f221---89492737711.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5222b8d04---49321423428.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/55b03cb6b2a1cb67e157f12a20143495/86966701997.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/85390116830.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=how+to+unlock+an+android+phone+when+you+forgot+the+passwordPDF link annotation
    • 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_off0001d1fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D1FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001ea10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EA10 18632 bytes
SHA-256: d7542badb81c9928efb2ff3dffc4d4355871293b24c2a10d4883cc884750fd10
font_02_sfnt_off00021bb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21BB1 11284 bytes
SHA-256: c432a73050fd0cb02336f6fb0b6f16e6a686fdbfe9e185b50c1ede6e841d19ba

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