Malicious PDF — malware analysis report

Static analysis result for SHA-256 8161aeac9d2fae0f…

MALICIOUS

PDF

82.0 KB Created: 2021-07-04 23:27:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 60274e38858b9351800d1e7b5e170299 SHA-1: 291746cf5d5edbebe986d89b20a06ea223982bf6 SHA-256: 8161aeac9d2fae0f5041ca786b6a817b281a5e220a6aebef81e6c1edec031cf2
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and multiple external links, many hosted on compromised CMS uploads, suggesting an attempt to redirect users to malicious content or download further payloads. The presence of a visual download button and the ML classifier's high confidence score further support a malicious intent, likely a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 https://garglob.ru/uplcv?utm_term=group+1+study+material+in+telugu PDF link annotation
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/ccdb5fed467e06dbf99ea1107111d12d/govibawozetonomixifen.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/0f8ef2b49d2a6361798df5fcd5b225af/pabiv.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/c9tt35atmf3gum5e7ffc4e879h/vibokib.pdfIn PDF document text
    • http://coffee33.ru/archive/file/serurijilelazet.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bd3a89b0d82---vifobeperivapenif.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/be52589eeecd1cecf3007e5e9548972a/68856985435.pdfIn PDF document text
    • http://feldbach-tourismus.at/files/28114367980.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/3ae1cc11c7c6b569baab710371bd026e/55125143292.pdfIn PDF document text
    • http://apvn.info/userfiles/file/37802094441.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/dmjv04kq4u4h2lp3econsqidbj/musalatutoruxofedos.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd12d3434a---48328561344.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/51629000388.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/valesudumoxolixo.pdfIn PDF document text
    • http://briarcliff70.com/clients/874901/File/81408684903.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/wotekufafufufetewu.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607200a794ec6---lunisolitax.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/b81eefee8157ae73846651209c118c52/rumekowekaxijejo.pdfIn PDF document text
    • https://vietfun.com.vn/wp-content/plugins/super-forms/uploads/php/files/6qe4crrneua74fdldunthphk9g/luteseli.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/bigakalaga.pdfIn PDF document text
    • http://tbm-mova.by/images_from_html_editor/file/79133151591.pdfIn PDF document text
    • http://tsutae-f.com/js/upload/files/mutinubakifofu.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/al94c5e9hdq3iolb180h8qoc8u/55752908014.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da0ae846cdb---98159712311.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16098693b11ca2---50882203482.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c57d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC57D 16488 bytes
SHA-256: d0e02ea597b059e12c640018e4c0b859d2fbe31b167f59dc9fd0dc6423c65742
font_01_sfnt_off0000dc65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC65 16320 bytes
SHA-256: 7e56df174453a3a6b74aea2c1be2971c3f690f6a7363393882e61d5b9c00dfb9
font_02_sfnt_off000106b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00011ece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ECE 11040 bytes
SHA-256: 53cbd9feaba3814299c64d8a52e86482b77b760157eae14789d043dd801ab3bb