Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2be65edc016d25c…

MALICIOUS

PDF

84.3 KB Created: 2021-06-26 18:51:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ec13d28dec0e85f47a6bad2daf57db1d SHA-1: ed30428f99ad1b35d7e84972d80b2bfc1226636f SHA-256: a2be65edc016d25c8cee93b45c1b02bc1670bc870d9a39480c360a4b8ebd069f
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or use disposable domains, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded links are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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 http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/et8vr5rdkmou43gskgiu4pi15k/49958505639.pdf In PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae9a8541d8d---15311386560.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/fb6fe3c5b001a223bd35e76283c0316a/kutega.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/68229610589.pdfIn PDF document text
    • http://studiogiovannone.com/userfiles/files/faniwaforidasawubetaka.pdfIn PDF document text
    • http://sun-eko.eu/files/file/47673287778.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077ba8a20758---feripakamuk.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16078c9b2a564d---94072268859.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/44496037082.pdfIn PDF document text
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/369563b04d1b397e287edf6d40436705/10421414482.pdfIn PDF document text
    • http://studioturina.com/userfiles/files/naguginarexin.pdfIn PDF document text
    • http://cuacuonanbinh.com/userfiles/file/rojopoxoladezud.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/vufejanobemuwanebana.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/26565204578.pdfIn PDF document text
    • http://thedreams.cz/files/53262837568.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/nutegelexokosu.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3022b9a919---siporewiwusetiputuwul.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16091e56a23312---56351692126.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/7307defdaa3289a1cd84f5b1e9366134/jajexunuke.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad34f128bdd---giniberufa.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb12f045cae---23966885068.pdfIn PDF document text
    • http://parzenica-bialka.pl/userfiles/files/29962885300.pdfIn PDF document text
    • http://szalkasszorutacskok.hu/app/webroot/files/content/files/1689661038.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095bbaf77cab---zesavofif.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/82d7b02f42a1acba61d4529d3c690e5b/jifexali.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/79527945854.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/3adec1a5f6b9fa5db57d96099acfdadc/20190433614.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=fry%27s+food+adPDF 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_off0000ea59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA59 10000 bytes
SHA-256: 34585000cf477d492bc3688b21fbc4f9c9897edd102536849713d81c400e584a
font_01_sfnt_off000100a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A4 16576 bytes
SHA-256: 1a9205a618d2932d887e5d14a680d3d5cfd7006586bec1ec440438d05feecd10
font_02_sfnt_off00012b9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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