Malicious PDF — malware analysis report

Static analysis result for SHA-256 644967be1e6d8cbc…

MALICIOUS

PDF

86.5 KB Created: 2021-09-13 23:26:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dabd29dda6a04d8b3f6538bb3be7523b SHA-1: 596a266d91460027b35b27d0e08442c41ae7a39d SHA-256: 644967be1e6d8cbcef723b3fb6aa585ef4644f7e01b7201ee4f128218ee0014d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites acting as link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery. The embedded JavaScript, though not fully analyzed due to obfuscation, is a common vector for exploiting PDF vulnerabilities or initiating further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff95465078---87356775728.pdf
    • http://starma.pl/files/file/setakesatinimin.pdf
    • http://piri-piri.pl/ckfinder/userfiles/files/51975249155.pdf
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/377a9e689d724235d796109677d561f9/30128703180.pdf
    • https://mimpisiluman.com/contents/files/mepotoxafokifanijiz.pdf
    • http://getampedmag.com/ckfinder/userfiles/files/xoxixewixixojojuwuzi.pdf
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e1bba1f0ed---vuwiwas.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613996783e6e0---1790278185.pdf
    • https://lose-weight.tw/upload/files/97488959746.pdf
    • http://xn--zb0by3yusal20ak5lcidnwigi.com/ckfinder/userfiles/files/1630886483.pdf
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/trmmtf0m7fk0nl52kon4t984j1/kijagetavilamadab.pdf
    • https://valve-toho.com/userfiles/file/pojagupanedadufidinasited.pdf
    • http://profil-metall.de/content/uploads/file/rujevovadezojaluwuvelu.pdf
    • http://xn--3bsx3iw22bmot.com/filespath/files/20210911202209.pdf
    • http://www.beverburcht.nl/upload/files/kunifulovinapasapeno.pdf
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/palopumotuxel.pdf
    • http://shijijiaming.net/filespath/files/20210908024254.pdf
    • http://madang.eu/f_pds/fck/file/kagajewajo.pdf
    • http://cetis156.neutronds.com/assets/js/ckfinder/userfiles/files/77605921005.pdf
    • http://xn----8sbemnkjd7bfu.xn--p1ai/design/img/upload/file/bunedozolibamuritotomibaz.pdf
    • https://emtracing.net/userfiles/file/22840267050.pdf
    • http://cc-loges.com/uploads/file/48390773436.pdf
    • https://ekoelprom.pl/public/images/editor/file/59985067736.pdf
    • http://aldobini.it/userfiles/files/puxebikesumenujimutigi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=multiplayer+sniper+games+android
    • 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_off0000f010.bin
75deb8c9d85d7a502fe2b5a2bda4deefb008286e326e028ab5fa20535d5a1f16
pdf-font-stream PDF embedded font (sfnt) at offset 0xF010 16664 bytes
font_01_sfnt_off00011b0c.bin
4628a11d7bb73466bb821835138cb6abaf2f3c0bb432013e0eb3e62764f2aa4e
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B0C 10944 bytes
font_02_sfnt_off0001343a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1343A 16792 bytes