Malicious PDF — malware analysis report

Static analysis result for SHA-256 e793a173fecdef71…

MALICIOUS

PDF

73.4 KB Created: 2021-09-26 23:01:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 432d6b680ae7c9c48f10c298fa76342a SHA-1: 906e7c40da41933069eb4961b7103cf43cf57908 SHA-256: e793a173fecdef71457da1db46fb6e03d51d97ae425daff6f79b68c76928c54e
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document exhibits characteristics of a callback phishing or tech-support scam by presenting itself as an official communication that prompts the user to call a phone number. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it may leverage embedded JavaScript or other mechanisms to facilitate the phishing attempt, potentially leading to further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/87vpjrmjdhbi1c31jp1cgre293/82389034008.pdf In PDF document text
    • https://xn--dokumaanahtarlk-llc.net/userfiles/file/24430914941.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/ae1ea225722db2f5d2c4818414fdac43/49226966440.pdfIn PDF document text
    • http://senkyu.jp/webroot/img/files/jodipukupot.pdfIn PDF document text
    • http://decom.pro/admin/ckfinder/userfiles/files/mofanimepedejakazi.pdfIn PDF document text
    • http://xn--80aafbjcazdrhzgiddbbcsg4l.xn--p1ai/pict/file/30680069284.pdfIn PDF document text
    • http://indago-rovigo.it/userfiles/files/niretedexedatomuv.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/7a3de1c0736a4fc82ec55ba42101b59c/baxokuroxipimikudoramal.pdfIn PDF document text
    • https://vibingvibes.com/userfiles/files/61354999851.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/binerizarenisawuzivipeko.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/golanaxabisazesedaveg.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/je3efi89gm9a1qjrfrl81dse4r/wugamijenaxa.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/161507d320c925---72055280364.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/747d666f1302423752cb68d3a3287192/pexepogutos.pdfIn PDF document text
    • https://maymac.info/userfiles/file/41596384887.pdfIn PDF document text
    • https://geya99.com/ckfinder/userfiles/files/15190235844.pdfIn PDF document text
    • https://rent-1.es/ckfinder/userfiles/files/64007284767.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/50550491639.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/defakepizemaganitiwapebir.pdfIn PDF document text
    • https://truckforceone.com/upload/editor/file/wudonabunavifotupe.pdfIn PDF document text
    • https://hanyauntuktesting.com/contents/files/11011433358.pdfIn PDF document text
    • https://www.libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/bolipirujunimi.pdfIn PDF document text
    • http://capriololaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/malopasumofusibiwataduzuj.pdfIn PDF document text
    • http://kubablimel.pl/Image/files/vowavajapikikan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=how+much+to+unlock+iphonePDF 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_off0000b920.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB920 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d137.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD137 10480 bytes
SHA-256: d0eb2a1cf2d8da6e09d9c7ae8cef8679a8f94035d42112ae67b1de51cb0c7c7e
font_02_sfnt_off0000e8c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C9 18416 bytes
SHA-256: f82ad0ee33612e205bdba1cc5c9bbeeb7b5422d6ce69e6e318f181821c779f38

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