Malicious PDF — malware analysis report

Static analysis result for SHA-256 503ea7aaa58e2d17…

MALICIOUS

PDF

78.6 KB Created: 2021-08-19 14:27:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 570c96646fbf3defc44d1178d0fe6e50 SHA-1: cea08f26803b015c0310dd2e5fca55437048fe30 SHA-256: 503ea7aaa58e2d173123d3b2399eae8fd96407610958a724dd772b48f01d5b97
176 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://detectiveoffice.net/userfiles/file/56979543523.pdf
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/3eaead54620e0c891fa43a2817769d5e/vuporajisadajewilixa.pdf
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/161189651076ec---5160939011.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d27e82bcc0---62095866324.pdf
    • https://emotionalgift.com/ckfinder/userfiles/files/80583897323.pdf
    • https://mvpartners.be/images/uploadedimages/file/10427067257.pdf
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611abd67832db---22878812527.pdf
    • https://edu-mate.kr/_UploadFile/Images/file/76982299468.pdf
    • http://dienmaythanglong.org/uploads/files/80165340815.pdf
    • http://thelonerangerfanclub.com/ckfinder/userfiles/files/tomonapapizutuxatu.pdf
    • http://dsagco.com/Upload/file/gakomunawegojo.pdf
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/dkickfbj6e72vvhgdu9rub49sp/79162796060.pdf
    • https://srilangkapools.com/contents/files/bozepokamirelevodag.pdf
    • https://caror.hu/ckfinder/userfiles/files/51057541427.pdf
    • http://montpellier-businessplan.com/mbp/upload/images/images/upload/ckfinder/salenusenijamironi.pdf
    • http://dija.lv/public/userfiles/file/ruzafelozefuwapupuwepo.pdf
    • http://e-hematologica.pl/users//file/kizinutin.pdf
    • http://assotechne.eu/userfiles/files/1194177620.pdf
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/s5s5seoui8lbi54q24e8d04es4/84880825461.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16073bed000c0c---36024112575.pdf
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083411cb398b---kebekikuvoxibogirigop.pdf
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092272610574---1990464584.pdf
    • http://hakanhurdacilik.com/userfiles/file/vigegatejeridobefodasul.pdf
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1290a55491---nixasizupekugufer.pdf
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/upmsb4661jhpt4q5tpqjngsrmc/fodunipotikakotun.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=ouran+highschool+host+club+manga+pdf+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb7c.bin
45ae226aaf735e48a5d937087f5a9cc0b71b8205080e1986ec6e4d7fad816cd3
pdf-font-stream PDF embedded font (sfnt) at offset 0xCB7C 17220 bytes
font_01_sfnt_off0000f851.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF851 16792 bytes
font_02_sfnt_off00011068.bin
b90dc03209d5da83f48e9dd278d7139d49878dbfdd94b03a0f81ed8248ddeb0a
pdf-font-stream PDF embedded font (sfnt) at offset 0x11068 11284 bytes