Malicious PDF — malware analysis report

Static analysis result for SHA-256 95a9efcbc5758c7c…

MALICIOUS

PDF

94.3 KB Created: 2021-07-04 00:53:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3229637955f51fcc07e37228b85428a5 SHA-1: 2ad80770ce9484337ab2f1b552b89e49be841d6e SHA-256: 95a9efcbc5758c7c61d223bb495592d43df1b33398d4864a9ef168af2d0eb2bc
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file exhibits multiple high-severity heuristics indicating malicious intent, including links to algorithmically generated URLs and compromised WordPress upload storage. The presence of a visual download button suggests a lure to download a second-stage payload. The ML classifier and ClamAV detection further confirm its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://trunglam.vn/uploads/userfiles/file/guduxupisefuligurisik.pdf
    • http://alexlunacoach.com/img/editor/file/43522958.pdf
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160ceadfd8dbc4---roruresatidosala.pdf
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a892ea3fcf6---venapilupokutizarujawud.pdf
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/2vs85p2d5ltbg9gn1kk51uu93u/17390387567.pdf
    • http://prosquash.by/data/15958306885.pdf
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/f738b0073b093887e0b8c6611f880710/18131709427.pdf
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/76rqu7589app7gjd0fqfoinbei/46025831137.pdf
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/6np87jgmrapj41uvgdi36kqrp4/36347024008.pdf
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/c353ffd017ac49d828d625f5ebb60e3f/xibesafozoto.pdf
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4722c67a59---41628448160.pdf
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/du9bt2nunos7t3mqkbkh7016od/38112745045.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fee6c3eeec---14912642959.pdf
    • http://ztkammer.at/uploads/file/46864490141.pdf
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b19d390bca3---newojozuf.pdf
    • http://travisreunion.com/clients/1/1d/1d9c560ef9ee6310b862f4c9d288d7bd/File/88576069755.pdf
    • http://kaitosushisb.com/uploads/files/27688753980.pdf
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160777466da38c---jozizevanoto.pdf
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bd957616ff0---xapimexipupewenobimuwuwob.pdf
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/f7fcf645356eed9fb06a9f6a5cca9ab3/deket.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/qual2u6blfgv3kk8lg2g6t0tt3/96853116353.pdf
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16090d587a1a2b---komakejidu.pdf
    • http://www.egavilanes.com/ckfinder/userfiles/files/12218548335.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160c8de6ca4a41---44345799812.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=electric+slide+for+beginners
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010b2b.bin
ff42e1d7ca4f7f69a7acf2d2ab2152ee2fc59f4029b4c8cd411ed1bc291f9157		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B2B 18308 bytes
font_01_sfnt_off00013a46.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13A46 16792 bytes
font_02_sfnt_off0001525d.bin
e00e0fc21ee8b4b7c755ee22dc088c16a201b177d2dec6200a2eb3b783d79ac3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1525D 10612 bytes

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