Malicious PDF — malware analysis report

Static analysis result for SHA-256 af0ab66568b53a56…

MALICIOUS

PDF

80.9 KB Created: 2021-09-17 23:01:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d267d06a41fbaf7c2efe0f9d5b7ad499 SHA-1: 84cd8c78119a55c23d848292a885792e9931a47b SHA-256: af0ab66568b53a56e9c2afc52e62fca5dcb9e5a04b935ea2b9dc2ee6a06cb90f
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-severity PDF_RANDOM_URL_LINK and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM. The numerous embedded URLs point to a link farm strategy, with many hosted on compromised CMS uploads and disposable domains, indicating an attempt to distribute further malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 8

  • 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 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://queure.ru/uplcv?utm_term=world+famous+lover+full+movie+in+telugu PDF link annotation
    • https://efnnma.org/files/file/83664938533.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/xepotani.pdfIn PDF document text
    • https://childrencareandliteracysociety.org/userfiles/files/50508710641.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/161311648ab5d4---51912718650.pdfIn PDF document text
    • http://law885995.com/upload/fckimages/file/81655506421.pdfIn PDF document text
    • https://architektor.ru/uploads/file/68535682548.pdfIn PDF document text
    • http://www.tm-africa.com/beta/public/uploads/cms_filescms_files/67410548108.pdfIn PDF document text
    • https://jamisonfurnace.ca/userfiles/files/rapekogipadakifolasefaj.pdfIn PDF document text
    • https://ceramicasvillaflor.cl/UserFiles/File/12138853649.pdfIn PDF document text
    • https://oriontradecom.com/ckfinder/userfiles/files/92433888343.pdfIn PDF document text
    • http://insfilings.com/skyzone_classic/upload/files/58656513678.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff0cbaec7f---26875246328.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161409bdcad69d---jikizemit.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/af61cc3dac0210ba5bfa0f564a1cf1c3/46618978684.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/53649791813.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/ranabeseguwigabik.pdfIn PDF document text
    • http://le383.com/uploads/files/gifoban.pdfIn PDF document text
    • http://laserinnsbruck.com/static/sudusugas.pdfIn PDF document text
    • http://barrospizzadb.com/uploads/files/moligavutuzekamelazeb.pdfIn PDF document text
    • https://haruhonpo.com/upload/haruhonpo/files/zidegujobivew.pdfIn PDF document text
    • http://laxycoffee.com/upload/files/lexaru.pdfIn PDF document text
    • https://yoimart.com/upload/file/20210918002425.pdfIn PDF document text
    • http://pokebarslo.com/uploads/files/letekipajire.pdfIn PDF document text
    • http://topup-fight.com/ckfinder/userfiles/files/97649952440.pdfIn PDF document text
    • 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_off0000d904.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD904 17172 bytes
SHA-256: 82f62aac2b851df21b0794f5c2f7c4bad19dcce9df65dfb863f99f54f80984df
font_01_sfnt_off00010540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10540 10856 bytes
SHA-256: 4abd26446ae84bd3e63fbdcf05a4b83575ab017eeb9978b2a41bccafaf6213cd
font_02_sfnt_off00011e24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1