Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c68b2bc1a5e15de…

MALICIOUS

PDF

70.1 KB Created: 2021-09-19 09:14:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d8c5c3b91f61b316d3c3e75bcaf7be6b SHA-1: b3556680a58c4cd4aff56809d79ff38436568953 SHA-256: 7c68b2bc1a5e15de142599e9b80619f2a6cace9243146e4537616c2de9cf73bc
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external URLs hosted on potentially compromised CMS platforms. The presence of numerous links and the use of disposable hosting suggest an attempt to distribute phishing content or further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://wamaeassociates.com/images/uploads/originals/file/18932550425.pdf In PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/161438d3d37dce---jejapegiwedigiw.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/161301ce71f787---574359982.pdfIn PDF document text
    • http://laros.cz/UserFiles/file/27880849906.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/52961755405.pdfIn PDF document text
    • https://artistprasanna.com/userfiles/file/16582268689.pdfIn PDF document text
    • http://ecovn.vn/uploads/news_file/56041162207.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/58967977176.pdfIn PDF document text
    • https://gonguyenkhoi.vn/upload/files/45229763393.pdfIn PDF document text
    • https://fetogram.com/images/upload/files/towajodupe.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/45147573be4dcc8e830eef99d6fa66da/pilifegimobajuxixini.pdfIn PDF document text
    • https://portecitadelle.portecitadelle.ca/ckfinder/userfiles/files/jowokal.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/14502549326.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613dccbe683a5---banogenijogojatarawogo.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/2c0aa56f45cc7e1997e512cd187d91a6/4228800470.pdfIn PDF document text
    • http://flapboxes.custompackageboxes.com/userfiles/files/20200657399.pdfIn PDF document text
    • http://sunnysolutions.it/uploads/assets/file/19825817044.pdfIn PDF document text
    • https://sapporomn.com/userfiles/files/gutagowab.pdfIn PDF document text
    • https://beldapin.com/calisma2/files/uploads/zoduzilivizesalej.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613200802f8af---29278954406.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/4a03cb639463ec153757513811f9ba7a/64231478072.pdfIn PDF document text
    • http://focalthai.com/file_media/file_image/file/41838953601.pdfIn PDF document text
    • http://industrialdevices.in/uploads/diselumomuduse.pdfIn PDF document text
    • http://goldcoil.com/uploadfiles/files/koxezoxaj.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/ktnlfklg51q3rsvrfr3u0dsj14/98705909116.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=download+contacts+from+android+to+pcPDF 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_off0000b599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB599 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cdab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDAB 14384 bytes
SHA-256: eb93805d233568f1c1e0e7b468bdd034c1437adb58a3d6ad98365c4b91adf7ad
font_02_sfnt_off0000f19d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19D 10736 bytes
SHA-256: bd34413d4f5026e35fb1083a7d85a00106aa934719ad2569910cc35bcb79092c