Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b93284a531de6cc…

MALICIOUS

PDF

92.4 KB Created: 2021-07-24 20:56:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 39eaeceef9829ebbc5a6309ff36d7b19 SHA-1: dc09497c795e41c75acdd5d4bf1d67aff8a2b39c SHA-256: 9b93284a531de6cc3a20360915a54b687dfe5e478af1c7ea6b9a4676c2bd1576
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs hosted on compromised WordPress sites and disposable domains, likely intended to lure users to malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to phishing pages or download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • 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 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://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/b6ib21ot57pbdr0cfbu2cq1vvm/95341858530.pdf
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16071683fe2fec---57400863378.pdf
    • http://garderoba.sk/images/_file/85864081736.pdf
    • https://nhachoxebus.com/upload/fck/file/69534476684.pdf
    • http://ahsaipu.com/v15/Upload/file/202154814145085.pdf
    • http://penney1970.com/clients/7/74/747debde904cce1d9d58e62e9103e361/File/79977682919.pdf
    • https://agrilaui.com/userfiles/file/34130722141.pdf
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/ln2ea78ma0416eduvk3fr8ji11/naruxiponezulenopoturev.pdf
    • http://lideparts.com/userfiles/file/1622140469.pdf
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a83f8a67eba---litutosomovo.pdf
    • https://addsfly.com/userfiles/file/lidujaxotitesi.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d680f912d64---sagoxer.pdf
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/0bc0ae48d435baa582ba43dfb377bc3c/somuxuxalegijeligadop.pdf
    • http://xoblates.com/clients/e/e0/e08cfb93fb97b00c28394d0532709dc9/File/kutoloritenigupapij.pdf
    • http://augustaelectricalwork.com/editorData/file/xuzetaxuk.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160aba9b41c200---fevadugefamowovawuxokij.pdf
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160a744fadeef0---21969485281.pdf
    • https://curvy.tw/upload/files/pibafanofativozofoxuwu.pdf
    • http://nmglyxx.com/userfiles/file/47049152637.pdf
    • http://vietthanhstone.com/images/news/file/kivoza.pdf
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d3f9023ea---84180292765.pdf
    • https://elnativocoffee.com/silver/upload/files/ridiz.pdf
    • http://drironcat.com/images/file/92799386890.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=keep+talking+and+nobody+explodes+bomb+manual+v1
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e488.bin
ee805167153643d6eeb72110079364c8fb095dcdc706a91f6fe2715c0ab542af
pdf-font-stream PDF embedded font (sfnt) at offset 0xE488 17164 bytes
font_01_sfnt_off0001112e.bin
156b791a0c90e26d43c4b099f024638c3c3125b5346517991ae664f012b07888
pdf-font-stream PDF embedded font (sfnt) at offset 0x1112E 2044 bytes
font_02_sfnt_off00011a81.bin
9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A81 16092 bytes
font_03_sfnt_off00012fc7.bin
d0b470c9729810d0edc864ee042fc4c101d4bec7820d9e1c7f3b2f7f87569e45
pdf-font-stream PDF embedded font (sfnt) at offset 0x12FC7 11292 bytes
font_04_sfnt_off000149f0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x149F0 16792 bytes