Malicious PDF — malware analysis report

Static analysis result for SHA-256 6923692dcf47a7db…

MALICIOUS

PDF

84.9 KB Created: 2021-07-03 23:18:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 788011632e58df5789d5e3afdbee4e2a SHA-1: ec9a248ceaf7db3d7adf0c6a7fb6260ba5e4de45 SHA-256: 6923692dcf47a7db3a721303adc54f03566b083f285d787a42cf9f8669fb201e
96 Risk Score

Malware Insights

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

The ML classifier and heuristics indicate this PDF is malicious, specifically flagging it as a link farm hosted on compromised CMS uploads. The document contains numerous embedded URLs, many pointing to WordPress sites utilizing form plugins for file uploads, suggesting an attempt to distribute further malicious content or phish users. No scripts were extracted, but the primary attack pattern involves directing users to potentially compromised external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • 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://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4c89137ad9---99722343710.pdf In PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/a68e7f86129644399f6503ed7ead9636/43833513381.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c9c5197b9ff---bediwapekokomadudaxirubip.pdfIn PDF document text
    • http://greatwalledmond.com/ckfinder/userfiles/files/14736955958.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/wotedegi.pdfIn PDF document text
    • http://ohmytour.kr/FileData/ckfinder/files/20210629_6BF60AA95B258AC4.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b651f773bc1---weputegegibepijakenineko.pdfIn PDF document text
    • http://olympusflights.com/files/files/seraga.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/ca81ed92aae3c9e52a8ff700907fc5ee/rigonuxitowuk.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b82ebc8cc78---mepasigunoras.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609906ab727f4---57324909419.pdfIn PDF document text
    • https://agatanorek.com/files/file/44063480638.pdfIn PDF document text
    • https://guclupin.com/calisma2/files/uploads/pusenuxisubosase.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/20213582926.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160deac4e8b668---91933709598.pdfIn PDF document text
    • https://mlmrockstars.com/ckfinder/userfiles/files/finamesisametononaguj.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160c9460079bd7---zapoxexisewixebevivip.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/aa707f97c3b7329404b9e9a553d48eb8/lesuvoxotan.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/volefopuxulotulonemiwa.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/0t8muhcttn3m3ag5fglfi69k8t/vajelefumorimepo.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607f038b72069---fujejabonisebaduvivowa.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f0c08dac6---vixonuxeruri.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b42e02f3592---lixawisuxumozikejanoromu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=giving+notice+to+employerPDF 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_off0000ea6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6F 16752 bytes
SHA-256: a90382c83673eea48920744a7613e2f10733d76e0fbec34efc26798413e70602
font_01_sfnt_off0001161e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1161E 10608 bytes
SHA-256: a91010cc1a70799620ebd3bd7e557408b94d532f9e827c4ed7ad0b8a516066b8
font_02_sfnt_off00012e5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1