Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd4050768de21824…

MALICIOUS

PDF

98.9 KB Created: 2021-07-02 02:54:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: e7eaa81ade8b59b2e3fc296fb771fdac SHA-1: 57fce96dd792a53826b5c396f069b3f0b58031b2 SHA-256: bd4050768de21824971eb7090496ef30c5f9df576a9fc1fce7daa70fbeda605e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. The PDF also functions as a link farm, directing users to multiple compromised WordPress upload directories, indicating an attempt to distribute further malicious content or phish for credentials. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 7

  • 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.
  • 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 http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d40668c8b65---bitozer.pdf In PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/ae96be28bc404ab8f4a59f547e08ac55/gerafetewixifolaf.pdfIn PDF document text
    • https://iringmalaysia.com/ckfinder/userfiles/files/27379439769.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609f3ec0b7039---liduxitukodev.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/16074300205.pdfIn PDF document text
    • http://hillsdale66ersreunion.com/clients/c/c6/c679c52642bc64dd8629b98fb95ccc77/File/67854831051.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/o851aujh0cog22t5a1grjf7huf/kazidimujumupimumufeso.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4f54968929---39312708021.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/105628f25a83031b37f8198095640cb8/zeduma.pdfIn PDF document text
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/eadd79974c5c79761add8547282cd34e/70141836601.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160de458e3c534---wuzufog.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/kakisuxunodipeke.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b2b91642a42---9262410590.pdfIn PDF document text
    • http://davidlbrooks.com/clients/868292/File/bapobetovem.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a0695f6ec98---19853539482.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/77567264336.pdfIn PDF document text
    • http://incucinaconalberta.com/userfiles/files/69721272767.pdfIn PDF document text
    • http://yilip.net/userData/board/file/662506038.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4257e1d181---49962002322.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d70114e2b6---27712879985.pdfIn PDF document text
    • http://to-kajihan.net/js/upload/files/63906704767.pdfIn PDF document text
    • https://mszukam.pl/dat//file/nofofagusujid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=church+bible+family+feud+questions+and+answers+printablePDF link annotation
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011dd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD2 17228 bytes
SHA-256: b737f2b112c32e5d2cc0915dcc3325028e87b753aeed9884f1fea6efd9d2b4d0
font_01_sfnt_off00014af3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AF3 11500 bytes
SHA-256: 060a164100420a1fc4fb21983f18a42cce16ae78b08a54c9fb26175cdae3cb3e
font_02_sfnt_off000165a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.