Malicious PDF — malware analysis report

Static analysis result for SHA-256 08550ce57afec706…

MALICIOUS

PDF

79.4 KB Created: 2021-09-01 02:56:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6443f2177bd60e5cb284bcaeae3a5806 SHA-1: 08364a097b83257e8c9bcd57ab54f5596876b49a SHA-256: 08550ce57afec706eb75c66df02540e6740d94d83fff89bbef1373e50b35081f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 7

  • 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.
  • 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.
  • 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://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070e8fb0d1b5---66162518752.pdf
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4bd8421318---66238689969.pdf
    • http://tanriovermensucat.com/uploads/genel/files/busituxojererelopepiv.pdf
    • http://atol-res.pl/uploads/file/8762187380.pdf
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd13b7cc24---fuvab.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160927aff79a52---luvapo.pdf
    • http://ipea.kr/userData/board/file/nusuketakukipufejarolo.pdf
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16110602ddb2c5---71692692716.pdf
    • https://orldoc.ch/wp-content/plugins/super-forms/uploads/php/files/th5vas7cvd455f1n4tch286ct3/kamizuduvumofofetupi.pdf
    • http://yournamebadges.com/withyourdog/cms_uploads/file/zozuruturajanapowut.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/nc9mnsa8pgdei31lumiju0h1k7/koponekidepibikupul.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160e54209b8f2d---29549844979.pdf
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/obfvkjbbbkog91u2ufria8tgso/povazo.pdf
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d867de177b---pexasoxa.pdf
    • http://cariboohose.com/userfiles/file/78682777574.pdf
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/c99e1845d353a9327e06d2ca197771d5/61558463668.pdf
    • http://hiace-yoshikawa.com/js/upload/files/pilurofumolufagavuxodotor.pdf
    • http://dorrstrechy.cz/UserFiles/File/luwudowozigawixerimeruta.pdf
    • http://khacdautron.com/Images_upload/files/20648526281.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160960b06557cf---ladiwigofikaxurifirewike.pdf
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160921764a8a59---jodovadaseguzele.pdf
    • http://yaqeen-eg.com/userfiles/file/9557351586.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=room+temperature+meaning
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000bb92.bin
7a057793925cc44d5a36e2905c56f56930527548020d395bce525f76792664bd
decompressed-pdf-stream PDF FlateDecoded stream at offset 0xBB92 18004 bytes
font_01_sfnt_off0000d789.bin
8b093bea7d576908658dbc2b0c033d9749bc0f93bba179afa60d58cf97a54d53
pdf-font-stream PDF embedded font (sfnt) at offset 0xD789 15752 bytes
font_02_sfnt_off0000ffac.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFAC 16792 bytes
font_03_sfnt_off000117c3.bin
692da11f45f617d775e0ee4a0c98eb29478496eec9ec1e449aee5c5feff0aaee
pdf-font-stream PDF embedded font (sfnt) at offset 0x117C3 10528 bytes