Malicious PDF — malware analysis report

Static analysis result for SHA-256 aae71aff9ff682ad…

MALICIOUS

PDF

89.2 KB Created: 2021-06-17 22:06:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 38285c219f229d51c33c949619f4d1a6 SHA-1: 9a5659501a64219a2a024b01476d55594cc8533c SHA-256: aae71aff9ff682ad32321810c276927b12a9af28e7689ffe54e9ce6028564759
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains a link farm pointing to multiple domains, some of which are hosted on compromised CMS uploads or disposable hosting, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://suapaiatuipelehakefamily.com/clients/80707/File/1242726617.pdf In PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bdbe18aa29c---varudumakapog.pdfIn PDF document text
    • https://curewelldiabetes.com/userfiles/file/vujirofoleguwixu.pdfIn PDF document text
    • https://inncredel.com/uploads/morufifux.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a817df175fb---rosumamekawufutasolur.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/44365323365.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086fe6a7a849---59730884039.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/3bae62041eaa2dc16a357a485c299eee/78682293408.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb42d9b935d---dogopoxijolulilakupufabon.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc86cbeaa3---zeferevuz.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/i0oks011mhtnaohcp6g2vrcjlv/55570988419.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/1246725176.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/jalixowugegosotu.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/63809796601.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a24a061d1e7---76912187067.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=lyrics+of+chidananda+rupa+shivoham+shivohamPDF 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://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DE 3088 bytes
SHA-256: 942eaff392e5de876000286622d36cc4fa1088c517dd65fb3ed48d1e2175ac34
font_01_sfnt_off0000ede4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE4 5464 bytes
SHA-256: d4fc5d4a1ed69ededcf4360c2390c584f9d01c38f7012c21d47cd302afba1db1
font_02_sfnt_off00010067.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10067 3740 bytes
SHA-256: 49a7b6a6022ad0750f3ce9b713f85c7cd2f2c955e32e46ddff28ce33b45939fd
font_03_sfnt_off00010be1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE1 10176 bytes
SHA-256: 96ee39bd6ba82f4c3b6742dd93969a01139a485cd3374a1a1c8ed373ab228ffa
font_04_sfnt_off00012e56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E56 12808 bytes
SHA-256: 6407784cef5282898bc48d098eb7f669ecbd9f24d1035c1f290c22f4356c8ca9

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