Malicious PDF — malware analysis report

Static analysis result for SHA-256 dca708cffc96716e…

MALICIOUS

PDF

88.4 KB Created: 2021-06-30 07:25:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 9c78ffd9cd8b77378ea3d0f81ba9b0b7 SHA-1: b250a14759d3a28ccc70d637a8023b70e379c69a SHA-256: dca708cffc96716effdd196593a31e75428af8908077cc4d4e81d6a515b7887e
176 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users. The 'SE_CALLBACK_LURE' heuristic suggests a phishing or tech-support scam pretext, while the ML classifier and ClamAV detection confirm its malicious nature. The primary attack pattern involves tricking users into visiting these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/guwofujimarasajidodesuwis.pdf In PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9548ed4e5---nesufaxanakapifalap.pdfIn PDF document text
    • http://titusrelay.com/clients/e/ef/ef304ccc03541e9e6382bef5f13b0a7d/File/vuvutifeduwimol.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/39272493490.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8494260e3---22634892485.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/f551e6161fdbb3128ef6c776e54acb0a/gomisajavegoragoze.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/29265744393.pdfIn PDF document text
    • http://cokhixnktientien.com/Images_upload/files/doperesolurawe.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6705d9976---38337730964.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/64108604836.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/26df09f774734da73ea64c85cd7641fa/78807188718.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/39e1b790be1360c49a91c00e99e8c8c4/65534680884.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/555de298bb3788c3f8a71a4dd4754082/75792864796.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/16095fc01a678a---xubezewudijizilibewafav.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c86c51490b---47938751133.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/aa733662613063a703d278e314e0bd20/29382743392.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/xidajoloxivuruwuwebite.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/56728058929.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/vh51oc5rr4c144hietep5iigma/42410296668.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160792ad896442---xazedoluv.pdfIn PDF document text
    • https://mimpishio1.com/contents//files/62455283649.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/e9d0fbf38882789108f3e583048a3082/dajoburetibix.pdfIn PDF document text
    • http://homeopathyhk.com/files/vudenukalowuva.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/zasokufoferisolexuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=aptitude+test+pdf+for+mechanical+engineering+studentsPDF 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_off0000f19d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19D 17668 bytes
SHA-256: 113e4815c279f4435810abd755090260e0046e56d205bc51ad5f05de39960595
font_01_sfnt_off0001202d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1202D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013844.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13844 11148 bytes
SHA-256: 5d11bbe69e3367949c08c948dce6c13ebd6faa46ef25d05a4bdb2fc531ab6c16