Malicious PDF — malware analysis report

Static analysis result for SHA-256 e05f3e2f50d3037e…

MALICIOUS

PDF

86.5 KB Created: 2021-09-01 04:02:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a716ce6102af430b2eb8bdcf54d13505 SHA-1: c8c9dceb4bd1636a43db51e193000b3360488c4e SHA-256: e05f3e2f50d3037ed7103f4c753a8257c7f49caa43054f1ebd4e4cf2858a8fa0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded links suggest it's part of a phishing campaign, hence T1566.001 is relevant.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://playfromhome.org/clients/4/49/49939bf6a151252ba1adfe53d1befa29/File/49986799343.pdf In PDF document text
    • https://netshopnepal.com/userfiles/file/duvajaguvesepebojow.pdfIn PDF document text
    • https://kaisar168.com/contents//files/44862713026.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/42cb0f5f1d8a85cdad0c53aa42c8cf5a/75032545463.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16078ae34329c2---66989846326.pdfIn PDF document text
    • https://doctmcooper.com/userfiles/files/gimoduxoba.pdfIn PDF document text
    • http://4bx.pl/public/file/32250497023.pdfIn PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/91705459434.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf6e5a5c61a---tajunigujezazewasibalomep.pdfIn PDF document text
    • https://garraldaarquitectura.com/garralda_userfiles/files/48844508889.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/74822288164.pdfIn PDF document text
    • http://dtpokebar.com/uploads/files/39236514581.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16087a879f0493---pagipujon.pdfIn PDF document text
    • http://chromavials.com/d/files/gelojewufigabudojejuniti.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/18151662287.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/ruvekidawuto.pdfIn PDF document text
    • http://inarchengineering.it/userfiles/files/52336394628.pdfIn PDF document text
    • http://global-insurance-broker.de/downloads/60279200907.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2bb060c00---97439823845.pdfIn PDF document text
    • http://reklama-v-sochi.com/ckfinder/userfiles/files/nanovoxaxeribopofexuj.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/10d0bdd29c16fa2fdc3e6cdffd38541e/bakivoxefawe.pdfIn PDF document text
    • http://budaors.varosom.hu/userfiles/files/78979596069.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/73363521428.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=quotes+on+destiny+and+karmaPDF 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://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_off0000ea95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA95 19660 bytes
SHA-256: 6c705c26d517b73b6dc194e346fe76883d3acbd26f5591b117610faf475c63c5
font_01_sfnt_off00011e41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013658.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13658 10728 bytes
SHA-256: 4e0799a3f9a3d8e534904294d4f151840119bd5b79a1ebd1e946a625c4c96ba4