Malicious PDF — malware analysis report

Static analysis result for SHA-256 a89a232987ad520c…

MALICIOUS

PDF

82.7 KB Created: 2021-09-23 03:37:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 70f99980315b60129aaacc9263317f2f SHA-1: 998fb675f46dd84a941c268379d1886ef90540d9 SHA-256: a89a232987ad520cb64f3ebce627caf05ef072dff61f5593c8a075b99e0518c1
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The sample was detected as malicious by ML classifiers and ClamAV, and exhibits characteristics of a payment redirection lure. It contains multiple links to external PDFs hosted on various domains, some of which appear to be compromised. The presence of these links suggests an attempt to redirect users to malicious sites for phishing or credential theft.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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.
  • 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://univerosg.com/ckfinder/userfiles/files/jawinisesepixu.pdf In PDF document text
    • https://alev.az/userfiles/file/68199111053.pdfIn PDF document text
    • http://administratieindex.nl/images/uploads/47374330337.pdfIn PDF document text
    • http://industrialdevices.in/uploads/powunas.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142d665c0fb8---redaleduxikujaduvijira.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/14407678473.pdfIn PDF document text
    • https://jackinthegym.com/uploads/files/202109172047362367.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/xeses.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/202199162132884.pdfIn PDF document text
    • https://shriayurvednagpur.org/public/ckfinder/userfiles/files/zumejeseverugupomunafapid.pdfIn PDF document text
    • http://sro52.ru/uploads/files/dulik.pdfIn PDF document text
    • https://happyfun.tw/uploads/files/202109140605249365.pdfIn PDF document text
    • http://yonseri.org/userfiles/files/48961122025.pdfIn PDF document text
    • http://hoya-system.com/uploads/files/202109131919403919.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1631529982.pdfIn PDF document text
    • http://cameragiaminh.com/upload/files/fezaperidovob.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/10836622595.pdfIn PDF document text
    • http://lateonsettay-sachs.org/userfiles/file/27713342421.pdfIn PDF document text
    • http://darec.sk/files/files/gozuruxanipa.pdfIn PDF document text
    • http://nocleginaplus.pl/uploads/userfiles/files/12565312740.pdfIn PDF document text
    • http://www.tivafa.hu/upload/file/sagubulutev.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/fe5bc7f9712c7dcbbb3660c2b283ce12/76433447404.pdfIn PDF document text
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/botofatar.pdfIn PDF document text
    • http://baggiez.net/userfiles/file/nogexudawokixagopon.pdfIn PDF document text
    • http://agavietnam.com/img/files/sivimusumarelolopizexemul.pdfIn PDF document text
    • https://xn--espaoldetalca-lkb.cl/var/www/html/upload/file/nurupa.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/e346ba2bb5bd9280aa809c6b88fd4eb0/50152773177.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+clear+data+from+android+phonePDF 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_off0000e15d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE15D 16472 bytes
SHA-256: 483eb9a5f88d713f878ab7424757efbec758cbb8a31c688d42508a218f3724d2
font_01_sfnt_off00010c12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C12 10796 bytes
SHA-256: b13ac71620f85262a6b786c69a42a6d905adc9c0de172c50ffbb639433884c29
font_02_sfnt_off000124b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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