Malicious PDF — malware analysis report

Static analysis result for SHA-256 44fd98c2017e7276…

MALICIOUS

PDF

112.8 KB Created: 2021-07-03 05:22:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 4d5ba9af945a441e09ec666f25bba547 SHA-1: 630215e5f3668f189fee70ccb35fe0a4893894cd SHA-256: 44fd98c2017e7276e90d0346bb7a1804f49adb93f11d9722a5f97cc7f12195d5
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically phishing. No scripts were extracted, but the document structure and URL analysis are sufficient to infer a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160943c7aa5354---26321344755.pdf In PDF document text
    • http://baraanduliaptti.org/userfiles/file/dimuvapumaxezimodas.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/5aefacd4f797ace99f61bbbf644364a8/nijimiposozokexigubepubew.pdfIn PDF document text
    • https://edmaker.site/wp-content/plugins/super-forms/uploads/php/files/da75c675b1017bf5c809063b56f14ac9/xubim.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d5676e2db---59957470975.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/41088597947.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/87634369682.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/6nbdn72m7lfupjclkfth2qqduu/zowawanelak.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/mozezudonenikogonilitejur.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3daeb8a7e3---mozokikapujebonojevupuz.pdfIn PDF document text
    • http://schokobrunnen.com/idata/tuxego.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/zixoriza.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/10b897a60ce4bda821764a58c95cb128/56461255288.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/56196401543.pdfIn PDF document text
    • http://josephpowellfamilyreunion.com/clients/0/04/04c15d356d3082020e114f8c0300f46e/File/padumedopugizatezujano.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d7cc3ce58---34326832776.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/rapejadar.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/wopisi.pdfIn PDF document text
    • http://fertilityupdates.com/userfiles/files/78017701765.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c91292e1fa---tebuvuwiv.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/xedobu.pdfIn PDF document text
    • http://chronicles.ae/userfiles/files/piwozavudarurivutaf.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/lumumeti.pdfIn PDF document text
    • http://amy-tsai.com/images_express/userfiles/files/75269267300.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=what+is+not+a+mandatory+metric+for+manual+testing+istqbPDF 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_off000155e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155E9 11416 bytes
SHA-256: dfb491cdbbf216f06f17205c3a524e4ebde3d86ff14789ff7869498191e0e23e
font_01_sfnt_off0001702e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1702E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00018840.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18840 17396 bytes
SHA-256: d3aa5646e7d5bfff99b693b360e0cb132621184d04a3e4210f04b015838602fb