Malicious PDF — malware analysis report

Static analysis result for SHA-256 84f1381c852819ba…

MALICIOUS

PDF

82.2 KB Created: 2021-09-07 23:37:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 621e2094cd9ff7988b381342e5ea6b4d SHA-1: 64783afce5d90ab3a05c9d3af4370f69827f0371 SHA-256: 84f1381c852819ba3d4c1d23866751ebec8f1b3f513a9c7e238faa7570dfe3cc
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to compromised WordPress sites and disposable hosting, indicating a link farm designed for phishing or malware distribution. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. The primary attack pattern involves redirecting users through these links, likely to deliver a malicious payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/899ce15c6746fe78da2496ff33885486/nibimomizadex.pdf In PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/b2be4713b66289b228069933d5907e1f/85418847463.pdfIn PDF document text
    • http://boothbayharborshipyard.com/userfiles/file/55064631806.pdfIn PDF document text
    • https://aildf.in/userfiles/file/maxarolisixutizu.pdfIn PDF document text
    • https://farmaciasacoor.com/site/upload/file/39148473027.pdfIn PDF document text
    • http://kardelendalgicpompa.com/uploadfiles/file/37111067418.pdfIn PDF document text
    • http://bigxra.com/uploadfile/file/2021061418500673499.pdfIn PDF document text
    • http://tcurryproperties.com/konadnew/userfiles/file/24374478432.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16095d3be1f9c1---lazagikuremubewopatonude.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1607a36e5ac935---juxirixululokaruselixaloj.pdfIn PDF document text
    • http://yoron.net/up/files/91117432907.pdfIn PDF document text
    • http://thehedgerowchronicles.com/ckfinder/userfiles/files/zizifabawifegirimisurum.pdfIn PDF document text
    • https://k-barrierfree.com/FileData/ckfinder/files/20210808_6D2C7B4388851B79.pdfIn PDF document text
    • http://moto-bike.pl/userfiles/file/93912597253.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/pmu063ej4bba1qfj9m0pmt616s/burijowaxasi.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612949d4079ed---40000735368.pdfIn PDF document text
    • https://dichvuhappyhouse.com/upload/files/liganizazotuboxatusin.pdfIn PDF document text
    • http://kaies.net/upfiles/file/37923666370.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/bc7506c3a2a3511d4041d47d298585f1/jadopovuregiradeba.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160fd09708e655---32003670372.pdfIn PDF document text
    • http://osstemcardiotec.com/files/fckeditor/file/1603944715611bc7c8a70f8.pdfIn PDF document text
    • http://presssimayeshahr.ir/pic/file/853180314.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/86643402874.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=lumbar+exercises+pdf+aaosPDF 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_off0000d7fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7FE 19816 bytes
SHA-256: 78e5016fdd68e5e0b81a2e329b70cfaf8baf75f225e5608c8e79011c7362cb46
font_01_sfnt_off00010b18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001232f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1232F 10832 bytes
SHA-256: 6dfa52556f758ad936888ec042215d030fd0da243b096a1c3e5392a0dfb23d6b

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