Malicious PDF — malware analysis report

Static analysis result for SHA-256 27b436032ae1557d…

MALICIOUS

PDF

75.0 KB Created: 2021-09-08 07:50:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a364b22ec4f22e00a3e15b6ab5dc51d2 SHA-1: 811c3da9bcd239ea2f10ef91a968d7a0046361e0 SHA-256: 27b436032ae1557dd130155e0ef3a9b6aee9b8df7c6ed4177bfb17c17e95708d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm to distribute further malicious content. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

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://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/iqcrr5334vfe3dji6ii803bm64/7493064892.pdf In PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160c9f474814f6---vusojituxinasojumojosewa.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/16629315832.pdfIn PDF document text
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/nexowegavikolutifi.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/kqi4pprj675hc921jrr3ac7u16/53417197870.pdfIn PDF document text
    • http://artio.pl/files/files/66878709723.pdfIn PDF document text
    • http://hijoin.hu/editor_up/risimosepasemezavalepasa.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/mifiworelomuripuzada.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afdceb3ae07---33522098662.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/7cfbeb73aff25f0a033b8681ff8df81f/46849153827.pdfIn PDF document text
    • http://bellamy.tw/uploads/files/202108141220446834.pdfIn PDF document text
    • http://doks-films.com/pcms/content/file/wawufopabet.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131a3aa3e0f0---86649694576.pdfIn PDF document text
    • http://momsystem.ru/public/file/43156508653.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/bfce3c528a1945225c2f9e5e95df7e63/makawoteguba.pdfIn PDF document text
    • http://clubmaniacr.com/campannas/file/25660876206.pdfIn PDF document text
    • https://aksukartela.com/images_upload/files/58552789210.pdfIn PDF document text
    • http://cncforginghammer.com/d/files/82761527216.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e829d224bf---38651773923.pdfIn PDF document text
    • http://euroear.eu/ckfinder/userfiles/files/niraduxerowijid.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/84585433758.pdfIn PDF document text
    • http://topcudental.com/img/userfiles/files/zugifi.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/darawalilajofaronejowe.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160da423cc6089---36055121277.pdfIn PDF document text
    • http://greenberetrotcmedals.org/clients/e/ee/eef2f5edcbf7b69ea683240098563b39/File/44502686472.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/78933990264.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/hsqvmkmfk0g5hvnnfvvvr2iaeo/96330779688.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=budget+planning+worksheet+freePDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC399 15888 bytes
SHA-256: 47c8e15698678dc7bebc3dbed344c2a13cca1200c608b5e55196688157285e9a
font_01_sfnt_off0000ebf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10410 11108 bytes
SHA-256: 46232bc7c1afade720b24533034dc8099705ae3e0f3912ff3e84bac95dfc4dcc

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