Malicious PDF — malware analysis report

Static analysis result for SHA-256 56a13dd5345f94e0…

MALICIOUS

PDF

151.8 KB Created: 2021-07-02 20:51:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cba9b53485ea13da0ba7f4e400831ce3 SHA-1: b76a1d812ddfcb7c0040349d5d1d995655799f1f SHA-256: 56a13dd5345f94e0c4e88ef5bf51edbcfa35d226b6a08c14607a791c3f117cc3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It functions as a link farm, containing numerous embedded URLs that point to compromised WordPress sites and other domains. These links likely lead to phishing pages or further malware downloads, indicating a spearphishing attachment attack vector. No scripts were extracted, but the structure and embedded URLs strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9742

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://cructi.ru/uplcv?utm_term=fundal+growth+chart PDF link annotation
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/cd20771f45e755b0182c7f46b9b16ba1/nedel.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/b88513b3ae7f32cc8267728c1e979b12/30776904568.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/7c1d515e38eccc78d8d46f995263b117/labonaverabepatotigawure.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/71311890726.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/1tap38k3pkcv5k7ctogs7ffd3l/paruruxagu.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/qpjak47ptsb0mrj7jekc60cn1b/74151222300.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/bureji.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/femijivobitar.pdfIn PDF document text
    • http://optykglowacki.pl/obrazki/files/38156505624.pdfIn PDF document text
    • https://progin.swiss/ckfinder/userfiles/files/lusogu.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/pelavoseput.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/uucu7v31ulebq3g0gdqq71eq92/vafofazexoj.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/53029742427.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/fosolokilijobawine.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/6a137bb41d0b79a842831426be511434/73329817733.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b2904bba77a---93792022197.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/rokesenoluxed.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/83260950987.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad4299175a---mowobezejom.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/20280712558.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/dbe76692a29bae0817505ef7dca0e08f/nedobirarewowemup.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b00b83dd2a1---daxiwolikizevamir.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/d1c6d8c4ae401333e3ef6e239344c922/77022318295.pdfIn PDF document text
    • http://n2nnetworks.com/files/others/67261463772.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/218053290353982fcc05696b6b4f17ea/67226840671.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a585458a61---43062040551.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab3b23e1d20---ragemivekukaremovovadazo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001f20a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F20A 10420 bytes
SHA-256: 7d97f42f543f29abc9c389c87dd4d0f19f72fbd11c46c78e3dcb42aa637a9bed
font_01_sfnt_off0002096e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2096E 18332 bytes
SHA-256: 168ae50e3e9bc01c1eab6752b3d07c4afded95b6c461941beea8661083738f20
font_02_sfnt_off00023986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23986 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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