Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a744061f4382122…

MALICIOUS

PDF

81.4 KB Created: 2021-09-13 23:07:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1d7ea2345eea8057529b18b878648b35 SHA-1: b1ba6a5ff1db0ca01720b73c60aaf1cace810ec0 SHA-256: 9a744061f43821220b96ddb7c005af810d9b3da82c8b01fd70543cd8bbe6eca1
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple heuristics indicating malicious intent, including random URLs, links to compromised CMS uploads, and a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest this is a phishing or trojan PDF. The presence of embedded JavaScript, though not fully detailed, likely facilitates the download and execution of a second-stage payload from one of the identified URLs, such as http://goldendoodlesofthesierranevadas.com/userfiles/file/fopajavuf.pdf.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • 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 http://donauwell.at/userfiles/file/rimufakolupawon.pdf In PDF document text
    • https://indiantiffin4me.com/nbloom/fckuploads/file/77398148068.pdfIn PDF document text
    • http://bernendorf.ru/userfiles/file/40039725933.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6470b2177---fonuwutesuneguvawe.pdfIn PDF document text
    • http://nrgmedia.hu/files/file/fogurazunepitirofama.pdfIn PDF document text
    • http://goldendoodlesofthesierranevadas.com/userfiles/file/fopajavuf.pdfIn PDF document text
    • http://corkpotters.com/images/zelabawirexumolowazeke.pdfIn PDF document text
    • https://holyfamilyhospitals.com/ckfinder/userfiles/files/xuxusopekipas.pdfIn PDF document text
    • http://olympusflights.com/files/files/zaxudevozijuselopikivubej.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/6edbbe4d2ee293ca11704e4c6cce216c/33900623404.pdfIn PDF document text
    • http://ph-easycome.com/userfiles/file/58320136506.pdfIn PDF document text
    • http://nilesk.com/userfiles/file/37483739127.pdfIn PDF document text
    • https://sandipkumardutta.com/ckfinder/userfiles/files/noxetipotitilexisiwinabil.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/xujemajexejaxisev.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/75652634124.pdfIn PDF document text
    • https://www.ftha.org/admin/ckfinder/userfiles/files/7040962126.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/pufarodarakekupebakut.pdfIn PDF document text
    • https://dreptultau.hotnews.md/upload/userfiles/files/23225763774.pdfIn PDF document text
    • http://www.bash.cl/media/file/duduwofuvuzumut.pdfIn PDF document text
    • https://fond.ru/userfiles/file/96356767531.pdfIn PDF document text
    • http://familiegravesen.dk/userfiles/file/18335906781.pdfIn PDF document text
    • https://timminsrenovations.ca/file/GNAUluRAaouGW9Rd.pdfIn PDF document text
    • https://izyskately.ru/foto/ck/files/1708126355.pdfIn PDF document text
    • https://marblo.com/app/webroot/img/files/wavexudikoxaz.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/39a3583c82711e71c94d61e25b885cd7/79506376205.pdfIn PDF document text
    • http://dissanna.com/temp/fckeditor/file/menob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=can+business+accounts+on+instagram+see+who+views+their+profilePDF 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_off0000d542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD542 11352 bytes
SHA-256: d4261c3ef5954d281c6fd518b42145f1ebcc6a3003eb8d93ecba249ff23d3f06
font_01_sfnt_off0000efb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB1 18400 bytes
SHA-256: ad04476f9f02074ec131a33ffb1aa76799067d7f1e8454a2c665568a1463896c
font_02_sfnt_off00011f76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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