Malicious PDF — malware analysis report

Static analysis result for SHA-256 94370d1fd79860d0…

MALICIOUS

PDF

104.1 KB Created: 2021-07-18 07:04:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 385baf2ecb51bfc21d937b0fa9ed84f7 SHA-1: 70017e5c29583ba89e20e022ce63c3e1c18234e1 SHA-256: 94370d1fd79860d083cf9d851deeb24c1931ec0036c42df99a68095fc21adbbd
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct user-facing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://catequesisnavarra.org/guiarte_userfiles/files/70879815039.pdf
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c14f95528af---33647206606.pdf
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160856247a2fb1---86327504056.pdf
    • http://setadijital.com/img/userfiles/files/pepanigodikenav.pdf
    • http://speaklifeiamgreatness.com/files/files/penoxovenavalisiduda.pdf
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/0dce2656cefb2b34030faa6a6e4e4ad4/3867487710.pdf
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160befb12519ad---75778791597.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16094c16b1e04d---benalidutalaz.pdf
    • https://keongracun.org/contents//files/73214245568.pdf
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c63aa18adb5---39186153990.pdf
    • http://frankslawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vawerob.pdf
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d867c310f49---dabujuforelobisovowepipe.pdf
    • https://tecnibat.net/uploads/archivos/98016592820.pdf
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/160872a1d7e742---5505807647.pdf
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/7c51032cf9cc25e8c67add57081622f5/25902474216.pdf
    • http://eltonltd.ru/sites/default/files/uploads/33750896746.pdf
    • http://md-servicios.com/userfiles/file/pelujokorotunevovajowulow.pdf
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/5707e6294be044206484b26b90942d46/71547997461.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608966dc62ffb---riwumiruzufivuvibosokiga.pdf
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/82a44f875c7d82c5c442598fa81d0787/47596575080.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/24d7hum396k2pi4hd401ahaet6/75661102206.pdf
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/274a00202811a0b1b016dac7e107f949/luwataregoloni.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=what+to+say+when+asked+tell+me+about+yourself+in+an+interview
    • 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_off0001318b.bin
1ed775dcb12fc8233db6c11c9dbd848569201d380a61f9c25f06450aae2b8218
pdf-font-stream PDF embedded font (sfnt) at offset 0x1318B 17952 bytes
font_01_sfnt_off00016098.bin
9c4f28976722a23a0042c63d48c817e14a56387acca7e5d72920532119eb1458
pdf-font-stream PDF embedded font (sfnt) at offset 0x16098 11212 bytes
font_02_sfnt_off00017ab0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x17AB0 16792 bytes