Malicious PDF — malware analysis report

Static analysis result for SHA-256 72515fb7b6130425…

MALICIOUS

PDF

82.3 KB Created: 2021-08-18 12:05:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 70cc5b794e26aab16774fdb060574bcc SHA-1: b9ed5995ee95f4e5acf0863b96985749fc541f36 SHA-256: 72515fb7b61304259adab48827e96008c1657ea1a28070eb356273d80c324203
196 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links, many pointing to compromised WordPress sites, suggesting an attempt to distribute malicious content or conduct phishing. The presence of algorithmically generated URLs further indicates a malicious intent to obscure the true destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 7

  • 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 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 https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c956d34832---rugedofiwidubanagovomu.pdf In PDF document text
    • http://fotocaroli.it/userfiles/files/dukojakoluxu.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/jukawavadolekixob.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/xijadazan.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072462934f02---92791256236.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161038e8bf39e6---64514552769.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/7633e2a80138a81aaf1632b477630a9f/56969743032.pdfIn PDF document text
    • https://31app.com/userfiles/file/58530601131.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/js7t4ai0mmn6avbbd07ihrhqa1/27312510146.pdfIn PDF document text
    • http://transporteslaplata.com/imagenes_web/file/98228870269.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c9c22314b05---mojiluxavukoj.pdfIn PDF document text
    • http://artistalexanderkanevskywinnerinternationalaward.com/clientMedia/file/44584073407.pdfIn PDF document text
    • http://saringkarnwood.com/UserFiles/file/71949063129.pdfIn PDF document text
    • https://skvely-kup.cz/files/file/vakagavil.pdfIn PDF document text
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/44887039540.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/raa1od46joq6eu1rmhm6i8c0l1/vagizovuv.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/846a6020d71f5015d7da4342ba7b5671/rujubo.pdfIn PDF document text
    • https://eitmedu.in/ckfinder/userfiles/files/24237395816.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/40370284152.pdfIn PDF document text
    • http://www.emailposte.com/pictures/modalinovikekifo.pdfIn PDF document text
    • https://norservis.com/files/files/1649399089.pdfIn PDF document text
    • http://autoscuolavalerio.it/userfiles/files/43321652344.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/e6b9c92b654f7fdf551649c24ac40e06/wuwagu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=santa+banta+funny+dirty+jokes+in+hindiPDF 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_off0000da97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA97 17716 bytes
SHA-256: 87c2e8cfd4da138363dac6515c876af9ebce3163b4f8356975b781abbb3da1da
font_01_sfnt_off00010909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10909 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012120.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12120 11056 bytes
SHA-256: f722a0afefeb7e0924fcfdeef1a2de1fc296cbfca87467487f5a93a5ef761549