Malicious PDF — malware analysis report

Static analysis result for SHA-256 144762ca5df92b4d…

MALICIOUS

PDF

130.9 KB Created: 2021-07-14 07:49:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c31c22dcdccf835ee76caceafb52255a SHA-1: d709820961b7fca63360a63719737f0f1fb6f514 SHA-256: 144762ca5df92b4d5111e67e7f3b702cf435b2d59e6f9aafb106b804987617c5
156 Risk Score

Malware Insights

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

The PDF document contains numerous external URIs and links to compromised CMS uploads, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing sites or malware. No scripts were extracted, but the extensive use of external links points to a social engineering or SEO poisoning attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9862

Heuristics 6

  • 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.
  • 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://inwebjor.ru/uplcv?utm_term=c%23+if+and+operator PDF link annotation
    • https://jpjplumbingandheating.com/FCKeditor/file/85754321666.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/db346602ff6d5c70bb708db3382060ef/gurixagadonof.pdfIn PDF document text
    • http://rurisnet.org/images/file/lexazewabev.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/c1c996e497cbd9447ba827f0e8f0b746/12046958539.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098dce063ece---buzixesa.pdfIn PDF document text
    • http://maility.pl_adresuserfiles/file/bekarewon.pdfIn PDF document text
    • http://vicorsupply.com/uploads/images//files/rumudowivikerakasobifot.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16082578d29c44---83938407868.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/67debd0c881108231f49a411e37ac0d7/9997993805.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8f79072be---kiwelafonesofitiwaxutepi.pdfIn PDF document text
    • https://extremedriveline.com/ckfinder/userfiles/files/fulugonovobunaxokalazoba.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16076237c8d650---38070683463.pdfIn PDF document text
    • http://aisef.org/uploads/userfiles/file/file/gizetuwomixovu.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/vokesufonuw.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/runurinonekapigazaxak.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16073090265020---25637463054.pdfIn PDF document text
    • https://avenue102.com/uploads/file/73724163736.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d52f5749928---47397408528.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/1221356041.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a8386fdea---loxejegox.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/16081eeb387cd6---27938863979.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc7f6341a39---nigutuwapuximutip.pdfIn PDF document text
    • https://dacola.com/upload/files/regidirepigimazofunuwuxov.pdfIn PDF document text
    • http://n2nnetworks.com/files/others/lusuvawelumivum.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018ba4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18BA4 9104 bytes
SHA-256: fe4a9ad32d6d12da45ce8861a1e6e511df5579fd33367a5c4d1c9e774d301804
font_01_sfnt_off00019e71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19E71 18436 bytes
SHA-256: 4f527f600d1f3ed14fa97db9559308de6fb10411baaaea94c4122117aa9a2de3
font_02_sfnt_off0001cf83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CF83 16700 bytes
SHA-256: 263fba459c43ef75c575ca363a77cc798276f4a347a51b0e06021682a2b3c25f
font_03_sfnt_off0001e706.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E706 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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