Malicious PDF — malware analysis report

Static analysis result for SHA-256 7aad1c9bc7bf3ca4…

MALICIOUS

PDF

84.9 KB Created: 2021-06-25 23:45:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: abe39de7194e47150891bd810f5b0012 SHA-1: ecf7249e9192d33468cef730496c64320612a9a5 SHA-256: 7aad1c9bc7bf3ca4ef902056c3854432a4d4c7b2a90c1d6a851d44253643edd0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, with numerous URLs pointing to external sites, some hosted on compromised WordPress installations or disposable domains. The presence of embedded JavaScript, though not directly analyzed for specific actions, suggests potential for further malicious activity such as payload delivery or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://muzeumostrowiec.pl/obrazy/file/liziwusip.pdf In PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/5no5a147pdvprsbd85bdbnlivb/ragim.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0adbb5d5c507ffc94194921b799ec52e/zukilijulek.pdfIn PDF document text
    • http://pvhs1967.com/clients/a/aa/aa78cb05297cd93d8a9ab6bd1eb8a3c4/File/76875104646.pdfIn PDF document text
    • https://zohopinler.com/calisma2/files/uploads/mafofesuderux.pdfIn PDF document text
    • http://wurbs-hanau.de/userfiles/file/23055413772.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/2efef165124e5cb7eb7a92f61825f23c/21995353386.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/5099860053f0dd00dfaa9538e6e7cec1/rimasikuvanamidude.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/p9f71qm7stjqfe4b55scmae8t6/woterijaditagerapu.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/186736ea291421a9e703c761d8ef0f63/tilemavefexixup.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160731fdacff39---ravebebajutilazikurixof.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/s4rjo0rdp174rt4he9uuet3pa3/jusutugomolug.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/8hhnt0sb40u6htf2lke74hjso9/31743033846.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/631729b84490e2c90ae744f498652ee0/gudolewiged.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/9uu9korrvvurr97rsajir8lkd5/83507479699.pdfIn PDF document text
    • http://shhs69reunions.com/clients/e/e9/e92da0bc0099326815942f81a5c18dfc/File/zetujodudulawexiruk.pdfIn PDF document text
    • http://aclamerica.com/customers/CMS-IMAGES/file/44583305836.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160acd2a361bf1---gezavomerozijesaxuwujigaj.pdfIn PDF document text
    • http://duonglaohanoi.com/userfiles/file/bifokanatobavej.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070ade38b746---mewutadizib.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/d51d5426918fe7a494f20345563d9e9b/mawugabofixevow.pdfIn PDF document text
    • http://springhs1988.com/clients/a/a7/a70db2535ed58991dd9724faf9b165d0/File/vefarekojur.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/89b73176381bd0d7ff4f149b638258a9/pepagililotaxupujomijo.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/1erlihc1b345qglhaedre2r56v/vinoj.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e461353dd2---19373725070.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=federal+time+served+calculatorPDF 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_off0000eb3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3F 16388 bytes
SHA-256: 9581ae467ae9ceefea80205af7bf817ea088f7f67a24a378540f4121591b36c4
font_01_sfnt_off000115e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115E4 10572 bytes
SHA-256: e225e741f362a2e9d40c2beb0ac510f0d07bfdcf4dde58534fced77c3cc7ff7f
font_02_sfnt_off00012e13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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