Malicious PDF — malware analysis report

Static analysis result for SHA-256 02a13d45190f7eb3…

MALICIOUS

PDF

101.7 KB Created: 2021-07-07 23:43:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ad0dfede5a4903f9689aef914c5ed024 SHA-1: 8fc9e3c6074ff8536cfc3e679d24dff3d80c16b4 SHA-256: 02a13d45190f7eb3ab60d185960b249cfda794c58b7634ad93e5c8e4b5c3086b
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised or disposable hosting domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the rationale is based on the link farm structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9711

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://cdwy028.com/uploadfile/file/20210626131646.pdf In PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/0bnm50a4q06pffmhicv11vqmc5/77182457972.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16071bd571216b---83201227223.pdfIn PDF document text
    • http://fletcherfamilyreunion.org/clients/52745/File/62613548834.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071755739d58---fezulipikozapeb.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/7db26d5a8b7a16511cf54c4eb06d6f3e/dalanokoliv.pdfIn PDF document text
    • http://accronline.com/userfiles/file/85571504803.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160797a3099a37---logupozodigigodejaveg.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d770a33f7---dazavaduvitona.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/56860173334.pdfIn PDF document text
    • https://ecole-anglais.com/upload/files/62853380345.pdfIn PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/tujafu.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16072aee54b6d7---joxilegurajuterigusamo.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/d93abf53a44c761fef4028907ab91a02/14693219174.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160983ba8ae7f5---30015361923.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16084f04590126---8306593952.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a702562b1e9---topovexisosojotagibu.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d5aed531c---bupukeduxaji.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/fp5dpogk5c2jn6k6cnl2pv1qm0/kizisugifabazedonetasi.pdfIn PDF document text
    • http://beepost.vn/upload/userfiles/files/xakonetewate.pdfIn PDF document text
    • http://yuhenganquan.com/userfiles/file/20210604061841_2075466101.pdfIn PDF document text
    • http://diencohoanghuy.com/media/ftp/file/12795458724.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/3c9bf419a911ac6310cceb9a98a69017/bosonexubiwinamobegoxi.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/wujudukonefizevuruga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=meaning+of+constituentPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0001673c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1673C 19636 bytes
SHA-256: 62b6491b261b5f0f9cedb68a857f34858693066ed34ad1e3d66eedd8c39da96b
font_00_sfnt_off0000ea66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA66 4228 bytes
SHA-256: c8ce94db0e7b84126a405f14efa6e1b53e056c4d9d901f725247e947f44375dc
font_01_sfnt_off0000fa01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011218.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11218 10460 bytes
SHA-256: 94732076ead8a4d4e176caacce0c0b937f98b26f07d3cb4dcb0b4fa14e62d922
font_03_sfnt_off000129fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129FE 25204 bytes
SHA-256: 788fdfb1be716286d5a26c44bf2c4f8aafec40199fb860e77d3073d2a131dc89

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