Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3c8e61f680a1d8a…

MALICIOUS

PDF

92.7 KB Created: 2021-09-05 03:22:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 96be978e1b7893fd02756a765dd2f3f8 SHA-1: 96801b7df90717a1a74af932596cdc16be73af20 SHA-256: a3c8e61f680a1d8afc75e161a46a03f3735490f2f1d8fbcfb87e98b9e3114670
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://cructi.ru/uplcv?utm_term=sistema+respiratorio+definicion+pdf PDF link annotation
    • https://charteriraq.ir/basefile/charteriraqir/files/kojibodujawegejodomofas.pdfIn PDF document text
    • http://webursitet.org/Files/file/dorisegugujiji.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/b1da38ca0c47c042ff6a0079c6030b27/28309263593.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/sekigomexutovikumenaz.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/vazurigoreluveboriviv.pdfIn PDF document text
    • http://sumtinathholidays.com/admin/uploadfiles/file/rebulaxiz.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1d98d7765---xusoxuzif.pdfIn PDF document text
    • http://avs-market.ru/admin/ckfinder/userfiles/files/ruvuraviwigumutisetetapib.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/gimukuxop.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/dilodagabovumonuxef.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1608a2028d82d4---babosoz.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/10ok2bmd93bf6ccdg97h32jqoe/73270362976.pdfIn PDF document text
    • http://paolacaone.eu/userfiles/files/fobigiwitiwukesovibo.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160f440371a478---zataxudidogilimavunolozav.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160772dd2b2950---21608627352.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160daf5e22a123---9888491232.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5cd8781be8b53c258b5df8b47e23f9af/niririvadewivazonowilobot.pdfIn PDF document text
    • https://szaktel.hu/uploads/file/waloxopu.pdfIn PDF document text
    • http://newabel.com/ckfinder/userfiles/files/bewugobopomade.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/47146099671.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb642ac745a---48821493894.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/ec037022ba90e0f3f06a5ed768a66af6/140729634.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092b1eaa6f70---65246258574.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_off000104ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104AC 10812 bytes
SHA-256: 63ef5450cf363376f0ad236e1629e3bd4b0c46055162cdafad07499b964ab971
font_01_sfnt_off00011d91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000135a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135A3 18936 bytes
SHA-256: 692aa1c390240e66a1d7e44e7197e3d1fc59fabd9779a509d89387a62049e2f5

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