Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ad8bcbb699b694c…

MALICIOUS

PDF

82.2 KB Created: 2021-09-16 14:56:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7ffbd5fc91c8af7da14ef598a8055d15 SHA-1: cc91b8aa36c7f10d54ab18c22bb93cc2a0210f56 SHA-256: 3ad8bcbb699b694cdbf50c034a937a6613717a10c9f8ad75d20c55f23189f58c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm pointing to numerous disposable domains, a common tactic for phishing and scam operations. The 'SE_CALLBACK_LURE' heuristic indicates the document likely prompts the user to call a phone number, consistent with callback phishing or tech-support scams. The ML classifier and ClamAV detection strongly suggest malicious intent, likely involving exploitation or redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://ilsungwarehouse.com/userData/ebizro_board/file/72454462934.pdf In PDF document text
    • http://cathugo-yachts.de/res/wysiwyg/file/patibazifomup.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/4561fd6399006c77b527104c3e7f1d9b/73726175641.pdfIn PDF document text
    • http://crystaltrade.hu/data/file/wotexowubipewikinu.pdfIn PDF document text
    • http://nriloan.jctoursandtravels.in/files/30025791425.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/zasixu.pdfIn PDF document text
    • https://zhavezbozi.cz/data/file/buniwisik.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133d448a8f3b---vujaj.pdfIn PDF document text
    • http://citadelcaralarms.com/userfiles/file/jerowowokikulijek.pdfIn PDF document text
    • https://megatekspb.ru/sites/default/files/uploads/92779647468.pdfIn PDF document text
    • https://mingyi-lock.com/data/file/userfiles/files/25248592764.pdfIn PDF document text
    • http://kimsanghun.com/upload/userfiles/file/2021911328108430.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/45e2566ed3837587771f58bb8f64114c/lifutovolitujimaxin.pdfIn PDF document text
    • http://nikkenj.com/userfiles/file/sowizunim.pdfIn PDF document text
    • https://kirbas.com/img/uploaded/file/sazitof.pdfIn PDF document text
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/29639988624.pdfIn PDF document text
    • http://materialdeestudo.top/userfiles/files/pifowezat.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413a36c5c48---45720841026.pdfIn PDF document text
    • https://sharks-cz.cz/images/file/rodanojumodoxokurekatabe.pdfIn PDF document text
    • http://xaydunglenguyen.vn/upload/files/e0ee72.pdfIn PDF document text
    • http://xn--42cfa4ewb0a0b3fwh.com/imageupload/files/82142547330.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/zasitijam.pdfIn PDF document text
    • https://drticket.ir/basefile/drtiketcom/files/16734318150.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/ni19ei58amd89em5iiuk7mud6s/85147386444.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=auto+theft+gangsterPDF 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_off0000db34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB34 18380 bytes
SHA-256: 491069b74ad5f35aae2af5a876bf284bcdfa9835c9acbed3843d42deb2123070
font_01_sfnt_off00010b98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B98 10436 bytes
SHA-256: 7db8eec4ef5b41bdaa5fecc293cd76998a2c887dfcffc076bb339aec25caa903
font_02_sfnt_off00012352.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12352 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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