Malicious PDF — malware analysis report

Static analysis result for SHA-256 04b71fe9c09e4f87…

MALICIOUS

PDF

163.6 KB Created: 2021-07-26 08:00:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 189bf19cf0f979d7b12e74023dc7439e SHA-1: a0f55f8450fa24dbd3bf123fa48955212d817c81 SHA-256: 04b71fe9c09e4f87aac078216a73000d8ded405e11c7e07985a129bc95e4e143
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, with many distinct hosts and UTM parameters, suggesting a phishing or malware distribution campaign. No scripts were extracted, but the document's structure and URL patterns strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9825

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://speeddating.lt/speeddating/ckfinder/userfiles/files/dobafubiniduso.pdf In PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/cf7692446d3825f135a7865c79ce5534/mefomediw.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/pbkl0eda2onr4gj5v4p7sh6sq1/vudobofurewiroviwan.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/36971215aa81b7806fea742faa8885e7/fifepawotige.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/bghla8j38h9qc7i0dic7vjf1l2/85821039977.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/6vl3k1hunputi7uk2a80rac2do/tokiluzenabas.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/g3dnkj5lv6tebebnle2gr2tqc0/numipatewaviguxazesu.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1609403774fdd4---kiserekukasabumam.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/30b44940e7b6a7a31428d4e487bab24b/fesopufedipewumunise.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd35e4a90f---veduv.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/3b123fc74457eae47ef889e1cb1ea92e/rarigil.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/zisasidalija.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c90844cf68---wijudufakonobodosa.pdfIn PDF document text
    • http://abwessex.com/uploads/files/30336544423.pdfIn PDF document text
    • http://redhillplantation.com/clients/1/1a/1a02e1fabf1298af97853074613e4b20/File/43938000120.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/vapuwilew.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/of7fh1qqi3ldj2n8o4si2vs9k1/dezejuzojatoge.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/bels2fbhc159ar7b6qklbd828u/kirabitofozumefebezeropov.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160c87c80a80b4---73224698135.pdfIn PDF document text
    • https://fullgame.hu/uploads/files/wagusepur.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160763e7d4692a---xofunujagogekebigafawibeb.pdfIn PDF document text
    • https://digireg.cz/upload/662967498.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16090507871e8c---segusak.pdfIn PDF document text
    • https://aaaxxion.info/images/file/3839503469.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/ropojimuk.pdfIn PDF document text
    • http://firegallery.ru/img/upload/dalotobalufezek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=els+ingilizce+haz%C4%B1rl%C4%B1k+dergisi+35+say%C4%B1+pdf+indirPDF 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_off00021805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21805 20420 bytes
SHA-256: dff3c76ec4b49a3c3e0531d12c6df4cea70932c176c71cf84481bfabec36b76c
font_01_sfnt_off00024ab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24AB4 11284 bytes
SHA-256: 65297a14f1aae495b98c6eebb5a75f243107e77a9187dfc8704ceb86918ff6c4
font_02_sfnt_off000264e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x264E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1