Malicious PDF — malware analysis report

Static analysis result for SHA-256 df9845a124188250…

MALICIOUS

PDF

85.4 KB Created: 2021-09-11 20:02:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 79a10e18d7132ea3732cabf2f3b94724 SHA-1: cb6a8a0b8fbd7c05180191ab8d0157dccba78e2e SHA-256: df9845a12418825023b4ce79d3b8900dad489f33449f5ed29e99adc75c3d2dec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of numerous unknown URLs further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9762

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://asthasupermarket.com/userfiles/file/wasexasifisapakezeze.pdf In PDF document text
    • http://dh-life.com/ckfinder/userfiles/files/nirufadiva.pdfIn PDF document text
    • https://rcvizovice.cz/ckfinder/userfiles/files/dipasuj.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/dd02fb8266b2d22d4a44ecd53ef293b2/botojokukewijegamuwora.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16130d596ef426---1983068285.pdfIn PDF document text
    • http://scoutpate.com/userfiles/file/podipad.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/fedalijawazusew.pdfIn PDF document text
    • http://ver9ctrl.sonikgps.com/ckfinder/userfiles/files/37300999127.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/dagudul.pdfIn PDF document text
    • http://denda.co.kr/ckfinder/userfiles/files/32528063080.pdfIn PDF document text
    • https://nhaccugiare24h.com/uploads/userfiles/file/murubugarinawekubaxifuv.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/70977165322.pdfIn PDF document text
    • http://marchmont.ru/imgs/file/nuvewurafujumiras.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/p82jnnlcif1q4bbudbrph2ki3i/gobelonugod.pdfIn PDF document text
    • https://calson.garment-pro.com/ckfinder/userfiles/files/53321152064.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138059347986---53882437182.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/dfa1e3caa13528c5bdbcca44595bf141/37798432191.pdfIn PDF document text
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/pexosipanewizugewaxalu.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/908026dc2c58cd5438f40578695f1e1d/xexip.pdfIn PDF document text
    • http://caogenzhiben.com/filespath/files/20210910152757.pdfIn PDF document text
    • http://doudou.tw/userfiles/files/fusopaturewugiselafuwikav.pdfIn PDF document text
    • http://balletpanov.com/uploads/files/56144175105.pdfIn PDF document text
    • https://o2opr.co/userfiles/files/mavibuwis.pdfIn PDF document text
    • http://dfwarbitrator.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/46662934294.pdfIn PDF document text
    • http://haozuowenwang.com/imagefiles/file/71771200596.pdfIn PDF document text
    • https://adikkedua.com/contents/files/lalemuwolubosoniwizana.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/0db2a3c8c1f21acb93df6653e5992cc3/43873711429.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=limbo+pc+emulator+android+apkPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8EF 18704 bytes
SHA-256: 2ca2d7f2de54886af07f9a939765d5fbbf1d10566c032af3e13129d3a4670a28
font_02_sfnt_off00011956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11956 10796 bytes
SHA-256: 8e108b40443940d97b49ea1adbeb00eb0c38b7851987c1b30b44563df6a0e8e6
font_03_sfnt_off000131ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131EA 16164 bytes
SHA-256: a0f26d9ec2bc0bbc84dfb8c1a224a49f7f70479ac92e21d726acd811d43f3bd1

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