Malicious PDF — malware analysis report

Static analysis result for SHA-256 934cdea07af10fa1…

MALICIOUS

PDF

90.3 KB Created: 2021-08-26 08:36:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: da3089b88794820431ff24e23c32e2f5 SHA-1: b6a4c042a9465b9e3b5183de7b4c5e4b69e0334d SHA-256: 934cdea07af10fa11a4cc83abf1e5ffcc0e9255604cae4470e3ca723340b31b4
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links pointing to potentially compromised WordPress sites and other disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm heuristics point towards an attack pattern designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://derma-dts.de/files/file/54364160503.pdf In PDF document text
    • http://beautybybelief.com/admin/images/file/31443919666.pdfIn PDF document text
    • https://west-holding.com/userfiles/file/kaketonabudapugeromovota.pdfIn PDF document text
    • https://bettyloupaints.com/userfiles/files/79456977.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083538c3de91---90519302626.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e79240becf7---15297995030.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/vamobazasaripovixedu.pdfIn PDF document text
    • http://stonestudio.pl/files/upload/file/rudalipuwaxugomiron.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/59713293326.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/ni5m1tns6589eg48e2m6eeig53/73280241604.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/xidaz.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/92864029467.pdfIn PDF document text
    • http://st-johnson.com/Uploadfiles/files/lugijutofobemuribit.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/3th6tf42c9oriumqfgb06jhq00/36863727559.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c1218300ebe---48629840265.pdfIn PDF document text
    • https://digireg.li/upload/galipewenaxubonida.pdfIn PDF document text
    • http://tele-klass.ru/i/upload/files/94937631949.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/4l6kei8n9vm9hk553fm7ufpg79/dinupotowisisivedise.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/vazinamulepodetotagusi.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e983153ad---vowevokatari.pdfIn PDF document text
    • https://www.micd.edu.np/ckfinder/userfiles/files/49812102987.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6a3a20d1e86b50661853f6189d87c46b/68267364822.pdfIn PDF document text
    • https://computerzone.pk/file/topamufemidojowor.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/88160696888.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=year+7+english+comprehension+pdf+with+answersPDF 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_off0000fbd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD7 16540 bytes
SHA-256: cbf8b2b594e92f9e3b853ebfcf9c6e3d66f5c9f490e5af260b83e8be7f9c3f24
font_01_sfnt_off000126c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126C0 11184 bytes
SHA-256: 3f33cb802c7f176b5ccbc996ee69e919a279381cdfd333bf3bd527679c2fcfad
font_02_sfnt_off0001409b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1409B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.