Malicious PDF — malware analysis report

Static analysis result for SHA-256 81322989955d517c…

MALICIOUS

PDF

96.7 KB Created: 2021-09-04 12:55:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7563e1a50826c939f9aa228de0550f09 SHA-1: 43493a03cd2ee6d5e286f7b59efb0dc42f22fab6 SHA-256: 81322989955d517c78f157cd8845523f5dd4d3d6cd33305600b6443b6856f451
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and a large number of external links, many pointing to compromised WordPress sites or disposable hosting. The ML classifier strongly indicated maliciousness. The embedded JavaScript likely serves to redirect the user to these external URLs, which are part of a link farm designed to manipulate search engine rankings or host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9879

Heuristics 6

  • 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://austria-ex.com/images/blog//file/85191169458.pdf In PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160878556c96fa---64815892191.pdfIn PDF document text
    • https://mgogs.com/mgfiles/file/vakafizi.pdfIn PDF document text
    • https://jxlmedu.com/file/files/20210811_050046.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c806d39a29---10926407512.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210709144217.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4obsoo097ohhk8q7j97bkfefg7/64993873082.pdfIn PDF document text
    • http://daiwavn.com/uploads/image/files/jagoniziremiwasadetif.pdfIn PDF document text
    • http://luvnchrlysenglishtoys.com/clients/861429/File/31944139203.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/e9d59481211fc4f15188e2b94803c89b/xazusezegupuvekepiba.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c9032982ffb---kenazuvu.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/nevokumumiralefobodazikuk.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/91600686416.pdfIn PDF document text
    • https://tasleemdubai.com/userfiles/files/44928831256.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e808ccc42e---10178892458.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/f2974ad5ede9e4ed26f70c709d5e8bc1/82233194783.pdfIn PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/kuvukojojagaxededewazuro.pdfIn PDF document text
    • https://amthanhanhsangchinhhang.vn/upload/files/sofisexinumotewemaguni.pdfIn PDF document text
    • http://win-sonic.com/kida2018/ck_imgs/files/62510141014.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/pupowototefupokamomosune.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16072a4769dc2b---nunaneb.pdfIn PDF document text
    • http://mcutech.net/files/rexabaduwesidazozil.pdfIn PDF document text
    • http://eis-pieschel.de/UserFiles/File/bifelutexogem.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/djdjsvc32ssv05cra09epuohtf/16738030621.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/27497571323.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/97848924289.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/dezafawipemejene.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=mavic+pro+platinum+operating+manualPDF 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_off000111ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111AC 19204 bytes
SHA-256: 35df688a1dcad8a69fcd314b9e81fadf01fa427fad26c59db64783b6ec5a8177
font_01_sfnt_off000143fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143FA 10708 bytes
SHA-256: 11fae37b065adbea4f962783eb828dacbe2bdac31dd1dda0a5bac34fa361ba19
font_02_sfnt_off00015c98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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